diff --git a/Frontend/1 het/backend/.env.example b/Frontend/1 het/backend/.env.example
new file mode 100644
index 0000000..d1034ef
--- /dev/null
+++ b/Frontend/1 het/backend/.env.example	
@@ -0,0 +1,7 @@
+PORT=3000
+NODE_ENV=development
+DATABASE_URL=postgresql://webstore_user:webstore_password@localhost:5432/webstore_db?schema=public
+JWT_SECRET=replace-with-a-long-random-secret
+JWT_EXPIRES_IN=7d
+COOKIE_NAME=webstore_token
+COOKIE_SECURE=false
\ No newline at end of file
diff --git a/Frontend/1 het/backend/.gitignore b/Frontend/1 het/backend/.gitignore
new file mode 100644
index 0000000..92f5a56
--- /dev/null
+++ b/Frontend/1 het/backend/.gitignore	
@@ -0,0 +1,6 @@
+node_modules/
+.env
+npm-debug.log*
+public/images/
+!public/images/.gitkeep
+prisma/dev.db
\ No newline at end of file
diff --git a/Frontend/1 het/backend/Dockerfile b/Frontend/1 het/backend/Dockerfile
new file mode 100644
index 0000000..7b784f6
--- /dev/null
+++ b/Frontend/1 het/backend/Dockerfile	
@@ -0,0 +1,14 @@
+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN apk add --no-cache openssl && npm install --ignore-scripts
+
+COPY . .
+
+RUN npm run prisma:generate
+
+EXPOSE 3000
+
+CMD ["npm", "run", "dev"]
\ No newline at end of file
diff --git a/Frontend/1 het/backend/README.md b/Frontend/1 het/backend/README.md
new file mode 100644
index 0000000..37c37e5
--- /dev/null
+++ b/Frontend/1 het/backend/README.md	
@@ -0,0 +1,88 @@
+# Webstore Backend (Laxer + CQRS + Prisma)
+
+Educational Node.js backend for frontend students.
+
+## Structure
+
+```
+backend/
+  prisma/
+    schema.prisma
+    seed.js
+  public/
+    images/
+  scripts/
+    extract-images-from-build.bat
+  src/
+    Api/
+      Controller/
+      Router/
+      Middleware/
+      app.js
+      server.js
+    Application/
+      User/
+        Command/
+          command.js
+          commandhandler.js
+        Querry/
+          query.js
+          queryhandler.js
+      Services/
+      DTO/
+    Domain/
+      IRepository/
+      Models/
+    Infrastructure/
+      Repository/
+    config/
+      env.js
+      prisma.js
+```
+
+## Run with Docker Compose
+
+```bash
+docker compose up --build
+```
+
+This starts PostgreSQL and API, runs Prisma generate/db push/seed automatically.
+
+## Auth (JWT in Cookie)
+
+- `POST /api/users/register`
+- `POST /api/users/login`
+- `GET /api/users/me` (requires cookie)
+- `POST /api/users/logout` (requires cookie)
+
+Cookie is HTTP-only and set with `sameSite=lax`.
+
+## Shop endpoints
+
+- `GET /api/health`
+- `GET /api/shop/categories`
+- `GET /api/shop/products`
+- `POST /api/shop/orders`
+
+Order payload:
+
+```json
+{
+  "customer_name": "Jane Doe",
+  "customer_email": "jane@example.com",
+  "items": [
+    { "product_id": 1, "quantity": 2 }
+  ]
+}
+```
+
+## Image extraction batch
+
+```bat
+scripts\extract-images-from-build.bat "..\build" ".\public\images"
+```
+
+Defaults (if arguments omitted):
+
+- Source: `..\build`
+- Target: `.\public\images`
\ No newline at end of file
diff --git a/Frontend/1 het/backend/docker-compose.yml b/Frontend/1 het/backend/docker-compose.yml
new file mode 100644
index 0000000..803dd17
--- /dev/null
+++ b/Frontend/1 het/backend/docker-compose.yml	
@@ -0,0 +1,39 @@
+services:
+  db:
+    image: postgres:16-alpine
+    container_name: webstore_db
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: webstore_db
+      POSTGRES_USER: webstore_user
+      POSTGRES_PASSWORD: webstore_password
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+
+  api:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: webstore_api
+    restart: unless-stopped
+    depends_on:
+      - db
+    environment:
+      PORT: 3000
+      NODE_ENV: development
+      DATABASE_URL: postgresql://webstore_user:webstore_password@db:5432/webstore_db?schema=public
+      JWT_SECRET: dev-secret-change-me
+      JWT_EXPIRES_IN: 7d
+      COOKIE_NAME: webstore_token
+      COOKIE_SECURE: "false"
+    ports:
+      - "3000:3000"
+    volumes:
+      - .:/app
+      - /app/node_modules
+    command: sh -c "npm run prisma:generate && npm run prisma:push && npm run prisma:seed && npm run dev"
+
+volumes:
+  postgres_data:
\ No newline at end of file
diff --git a/Frontend/1 het/backend/images/.production.env b/Frontend/1 het/backend/images/.production.env
new file mode 100644
index 0000000..4ac044d
--- /dev/null
+++ b/Frontend/1 het/backend/images/.production.env	
@@ -0,0 +1,19 @@
+# Copy and edit values for your production/student environment.
+
+# API
+PORT=3000
+NODE_ENV=production
+DATABASE_URL=postgresql://webstore_user:webstore_password@db:5432/webstore_db?schema=public
+JWT_SECRET=change-me-in-real-use
+JWT_EXPIRES_IN=7d
+COOKIE_NAME=webstore_token
+COOKIE_SECURE=false
+
+# Database container bootstrap
+POSTGRES_DB=webstore_db
+POSTGRES_USER=webstore_user
+POSTGRES_PASSWORD=webstore_password
+
+# Optional: host port overrides
+API_PORT=3000
+DB_PORT=5432
\ No newline at end of file
diff --git a/Frontend/1 het/backend/images/production.compose.yml b/Frontend/1 het/backend/images/production.compose.yml
new file mode 100644
index 0000000..bcdf27a
--- /dev/null
+++ b/Frontend/1 het/backend/images/production.compose.yml	
@@ -0,0 +1,36 @@
+services:
+  db:
+    image: postgres:16-alpine
+    container_name: webstore_db_prod
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: ${POSTGRES_DB}
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+    ports:
+      - "${DB_PORT:-5432}:5432"
+    volumes:
+      - postgres_data_prod:/var/lib/postgresql/data
+
+  api:
+    image: webstore-api:prod
+    container_name: webstore_api_prod
+    restart: unless-stopped
+    depends_on:
+      - db
+    env_file:
+      - .production.env
+    environment:
+      NODE_ENV: production
+      DATABASE_URL: ${DATABASE_URL}
+      PORT: ${PORT}
+      JWT_SECRET: ${JWT_SECRET}
+      JWT_EXPIRES_IN: ${JWT_EXPIRES_IN}
+      COOKIE_NAME: ${COOKIE_NAME}
+      COOKIE_SECURE: ${COOKIE_SECURE}
+    command: sh -c "npm run prisma:generate && npm run prisma:push && npm run prisma:seed && npm start"
+    ports:
+      - "${API_PORT:-3000}:3000"
+
+volumes:
+  postgres_data_prod:
\ No newline at end of file
diff --git a/Frontend/1 het/backend/images/run-student-production.bat b/Frontend/1 het/backend/images/run-student-production.bat
new file mode 100644
index 0000000..66647ed
--- /dev/null
+++ b/Frontend/1 het/backend/images/run-student-production.bat	
@@ -0,0 +1,69 @@
+@echo off
+setlocal EnableExtensions EnableDelayedExpansion
+
+set "ROOT_DIR=%~dp0"
+set "ENV_FILE=%ROOT_DIR%\.production.env"
+set "COMPOSE_FILE=%ROOT_DIR%\production.compose.yml"
+set "ARCHIVE_FILE=%ROOT_DIR%\images\webstore-production-images.tar"
+
+set "API_IMAGE=webstore-api:prod"
+
+echo [1/7] Checking Docker + Compose...
+docker --version >nul 2>&1
+if errorlevel 1 (
+    echo ERROR: Docker CLI is not available.
+    exit /b 1
+)
+docker compose version >nul 2>&1
+if errorlevel 1 (
+    echo ERROR: Docker Compose plugin is not available.
+    exit /b 1
+)
+
+echo [2/7] Validating required files...
+if not exist "%ENV_FILE%" (
+    echo ERROR: Missing env file: "%ENV_FILE%"
+    exit /b 1
+)
+if not exist "%COMPOSE_FILE%" (
+    echo ERROR: Missing compose file: "%COMPOSE_FILE%"
+    exit /b 1
+)
+
+echo [3/7] Loading prebuilt image archive if present...
+if exist "%ARCHIVE_FILE%" (
+    docker load -i "%ARCHIVE_FILE%"
+    if errorlevel 1 (
+        echo ERROR: Failed to load image archive.
+        exit /b 1
+    )
+) else (
+    echo WARN: "%ARCHIVE_FILE%" not found. Assuming images already exist locally.
+)
+
+echo [4/7] Ensuring API image exists locally...
+docker image inspect "%API_IMAGE%" >nul 2>&1
+if errorlevel 1 (
+    echo ERROR: API image "%API_IMAGE%" not found.
+    echo Run scripts\build-production-images.bat first or provide the archive in images\.
+    exit /b 1
+)
+
+echo [5/7] Starting production stack for students...
+pushd "%ROOT_DIR%" >nul
+docker compose --env-file .production.env -f production.compose.yml up -d
+if errorlevel 1 (
+    popd >nul
+    echo ERROR: Failed to start compose stack.
+    exit /b 1
+)
+
+echo [6/7] Showing running services...
+docker compose --env-file .production.env -f production.compose.yml ps
+
+echo [7/7] Done.
+echo API should be available at http://localhost:3000 (or API_PORT in .production.env)
+echo Stop stack with:
+echo docker compose --env-file .production.env -f production.compose.yml down
+popd >nul
+exit /b 0
\ No newline at end of file
diff --git a/Frontend/1 het/backend/images/webstore-production-images.tar b/Frontend/1 het/backend/images/webstore-production-images.tar
new file mode 100644
index 0000000..30e0b90
Binary files /dev/null and b/Frontend/1 het/backend/images/webstore-production-images.tar differ
diff --git a/Frontend/1 het/backend/package-lock.json b/Frontend/1 het/backend/package-lock.json
new file mode 100644
index 0000000..0394b19
--- /dev/null
+++ b/Frontend/1 het/backend/package-lock.json	
@@ -0,0 +1,1534 @@
+{
+  "name": "webstore-backend",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "webstore-backend",
+      "version": "1.0.0",
+      "hasInstallScript": true,
+      "license": "MIT",
+      "dependencies": {
+        "@prisma/client": "^5.20.0",
+        "bcryptjs": "^2.4.3",
+        "cookie-parser": "^1.4.6",
+        "cors": "^2.8.5",
+        "dotenv": "^16.4.5",
+        "express": "^4.19.2",
+        "helmet": "^7.1.0",
+        "jsonwebtoken": "^9.0.2",
+        "morgan": "^1.10.0"
+      },
+      "devDependencies": {
+        "nodemon": "^3.1.4",
+        "prisma": "^5.20.0"
+      }
+    },
+    "node_modules/@prisma/client": {
+      "version": "5.22.0",
+      "resolved": "https://registry.npmjs.org/@prisma/client/-/client-5.22.0.tgz",
+      "integrity": "sha512-M0SVXfyHnQREBKxCgyo7sffrKttwE6R8PMq330MIUF0pTwjUhLbW84pFDlf06B27XyCR++VtjugEnIHdr07SVA==",
+      "hasInstallScript": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=16.13"
+      },
+      "peerDependencies": {
+        "prisma": "*"
+      },
+      "peerDependenciesMeta": {
+        "prisma": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@prisma/debug": {
+      "version": "5.22.0",
+      "resolved": "https://registry.npmjs.org/@prisma/debug/-/debug-5.22.0.tgz",
+      "integrity": "sha512-AUt44v3YJeggO2ZU5BkXI7M4hu9BF2zzH2iF2V5pyXT/lRTyWiElZ7It+bRH1EshoMRxHgpYg4VB6rCM+mG5jQ==",
+      "devOptional": true,
+      "license": "Apache-2.0"
+    },
+    "node_modules/@prisma/engines": {
+      "version": "5.22.0",
+      "resolved": "https://registry.npmjs.org/@prisma/engines/-/engines-5.22.0.tgz",
+      "integrity": "sha512-UNjfslWhAt06kVL3CjkuYpHAWSO6L4kDCVPegV6itt7nD1kSJavd3vhgAEhjglLJJKEdJ7oIqDJ+yHk6qO8gPA==",
+      "devOptional": true,
+      "hasInstallScript": true,
+      "license": "Apache-2.0",
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+      "devOptional": true,
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+      "license": "Apache-2.0",
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diff --git a/Frontend/1 het/backend/package.json b/Frontend/1 het/backend/package.json
new file mode 100644
index 0000000..1277912
--- /dev/null
+++ b/Frontend/1 het/backend/package.json	
@@ -0,0 +1,37 @@
+{
+  "name": "webstore-backend",
+  "version": "1.0.0",
+  "description": "Teaching backend for a webstore using Node.js, Express, and PostgreSQL",
+  "main": "src/Api/server.js",
+  "scripts": {
+    "dev": "nodemon src/Api/server.js",
+    "start": "node src/Api/server.js",
+    "prisma:generate": "prisma generate",
+    "prisma:push": "prisma db push",
+    "prisma:seed": "node prisma/seed.js",
+    "postinstall": "prisma generate"
+  },
+  "keywords": [
+    "express",
+    "postgres",
+    "webstore",
+    "backend"
+  ],
+  "author": "",
+  "license": "MIT",
+  "dependencies": {
+    "bcryptjs": "^2.4.3",
+    "cookie-parser": "^1.4.6",
+    "cors": "^2.8.5",
+    "dotenv": "^16.4.5",
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+  }
+}
\ No newline at end of file
diff --git a/Frontend/1 het/backend/prisma/schema.prisma b/Frontend/1 het/backend/prisma/schema.prisma
new file mode 100644
index 0000000..67d8f4c
--- /dev/null
+++ b/Frontend/1 het/backend/prisma/schema.prisma	
@@ -0,0 +1,56 @@
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+model User {
+  id           Int      @id @default(autoincrement())
+  name         String
+  email        String   @unique
+  passwordHash String
+  createdAt    DateTime @default(now())
+}
+
+model Category {
+  id        Int       @id @default(autoincrement())
+  name      String    @unique
+  slug      String    @unique
+  createdAt DateTime  @default(now())
+  products  Product[]
+}
+
+model Product {
+  id          Int         @id @default(autoincrement())
+  categoryId  Int
+  name        String      @unique
+  description String?
+  price       Decimal     @db.Decimal(10, 2)
+  imageUrl    String?
+  stock       Int         @default(0)
+  createdAt   DateTime    @default(now())
+  category    Category    @relation(fields: [categoryId], references: [id], onDelete: Restrict)
+  orderItems  OrderItem[]
+}
+
+model Order {
+  id            Int         @id @default(autoincrement())
+  customerName  String
+  customerEmail String
+  totalPrice    Decimal     @db.Decimal(10, 2)
+  createdAt     DateTime    @default(now())
+  items         OrderItem[]
+}
+
+model OrderItem {
+  id        Int     @id @default(autoincrement())
+  orderId   Int
+  productId Int
+  quantity  Int
+  unitPrice Decimal @db.Decimal(10, 2)
+  order     Order   @relation(fields: [orderId], references: [id], onDelete: Cascade)
+  product   Product @relation(fields: [productId], references: [id], onDelete: Restrict)
+}
\ No newline at end of file
diff --git a/Frontend/1 het/backend/prisma/seed.js b/Frontend/1 het/backend/prisma/seed.js
new file mode 100644
index 0000000..15ca131
--- /dev/null
+++ b/Frontend/1 het/backend/prisma/seed.js	
@@ -0,0 +1,77 @@
+const { PrismaClient } = require("@prisma/client");
+
+const prisma = new PrismaClient();
+
+async function main() {
+  const categories = [
+    { name: "Shoes", slug: "shoes" },
+    { name: "Bags", slug: "bags" },
+    { name: "Accessories", slug: "accessories" }
+  ];
+
+  for (const category of categories) {
+    await prisma.category.upsert({
+      where: { slug: category.slug },
+      update: {},
+      create: category
+    });
+  }
+
+  const shoes = await prisma.category.findUnique({ where: { slug: "shoes" } });
+  const bags = await prisma.category.findUnique({ where: { slug: "bags" } });
+  const accessories = await prisma.category.findUnique({ where: { slug: "accessories" } });
+
+  const products = [
+    {
+      categoryId: shoes.id,
+      name: "Street Runner",
+      description: "Lightweight city sneaker.",
+      price: "18990.00",
+      imageUrl: "/images/street-runner.jpg",
+      stock: 24
+    },
+    {
+      categoryId: shoes.id,
+      name: "Trail Edge",
+      description: "Stable shoe for outdoor tracks.",
+      price: "24990.00",
+      imageUrl: "/images/trail-edge.jpg",
+      stock: 13
+    },
+    {
+      categoryId: bags.id,
+      name: "Urban Tote",
+      description: "Everyday tote with zipper top.",
+      price: "14990.00",
+      imageUrl: "/images/urban-tote.jpg",
+      stock: 30
+    },
+    {
+      categoryId: accessories.id,
+      name: "Classic Cap",
+      description: "Adjustable cotton cap.",
+      price: "6990.00",
+      imageUrl: "/images/classic-cap.jpg",
+      stock: 42
+    }
+  ];
+
+  for (const product of products) {
+    await prisma.product.upsert({
+      where: { name: product.name },
+      update: {},
+      create: product
+    });
+  }
+}
+
+main()
+  .then(async () => {
+    await prisma.$disconnect();
+    console.log("Prisma seed completed.");
+  })
+  .catch(async (error) => {
+    console.error(error);
+    await prisma.$disconnect();
+    process.exit(1);
+  });
\ No newline at end of file
diff --git a/Frontend/1 het/backend/scripts/build-production-images.bat b/Frontend/1 het/backend/scripts/build-production-images.bat
new file mode 100644
index 0000000..5ea58cf
--- /dev/null
+++ b/Frontend/1 het/backend/scripts/build-production-images.bat	
@@ -0,0 +1,49 @@
+@echo off
+setlocal EnableExtensions EnableDelayedExpansion
+
+set "ROOT_DIR=%~dp0.."
+set "IMAGE_OUT_DIR=%ROOT_DIR%\images"
+set "ARCHIVE_FILE=%IMAGE_OUT_DIR%\webstore-production-images.tar"
+
+set "API_IMAGE=webstore-api:prod"
+set "DB_IMAGE=postgres:16-alpine"
+
+echo [1/6] Checking Docker availability...
+docker --version >nul 2>&1
+if errorlevel 1 (
+    echo ERROR: Docker CLI is not available. Install Docker Desktop first.
+    exit /b 1
+)
+
+echo [2/6] Building production API image: %API_IMAGE%
+pushd "%ROOT_DIR%" >nul
+docker build -t "%API_IMAGE%" -f Dockerfile .
+if errorlevel 1 (
+    popd >nul
+    echo ERROR: Failed to build API image.
+    exit /b 1
+)
+popd >nul
+
+echo [3/6] Pulling database image: %DB_IMAGE%
+docker pull "%DB_IMAGE%"
+if errorlevel 1 (
+    echo ERROR: Failed to pull database image.
+    exit /b 1
+)
+
+echo [4/6] Preparing image output directory: %IMAGE_OUT_DIR%
+if not exist "%IMAGE_OUT_DIR%" mkdir "%IMAGE_OUT_DIR%"
+
+echo [5/6] Exporting images to archive...
+if exist "%ARCHIVE_FILE%" del /f /q "%ARCHIVE_FILE%"
+docker save -o "%ARCHIVE_FILE%" "%API_IMAGE%" "%DB_IMAGE%"
+if errorlevel 1 (
+    echo ERROR: Failed to export Docker images.
+    exit /b 1
+)
+
+echo [6/6] Done.
+echo Created archive: "%ARCHIVE_FILE%"
+echo Share this file with students together with production.compose.yml and .production.env.
+exit /b 0
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Api/Controller/shop.controller.js b/Frontend/1 het/backend/src/Api/Controller/shop.controller.js
new file mode 100644
index 0000000..a4a72b1
--- /dev/null
+++ b/Frontend/1 het/backend/src/Api/Controller/shop.controller.js	
@@ -0,0 +1,57 @@
+const GetCategoriesQuery = require("../../Application/Shop/Query/GetCategoriesQuery");
+const GetProductsQuery = require("../../Application/Shop/Query/GetProductsQuery");
+const CreateOrderCommand = require("../../Application/Shop/Command/CreateOrderCommand");
+const CreateProductCommand = require("../../Application/Shop/Command/CreateProductCommand");
+const container = require("../../Infrastructure/DI/container");
+
+const getCategoriesHandler = container.resolve("GetCategoriesQueryHandler");
+const getProductsHandler = container.resolve("GetProductsQueryHandler");
+const createOrderHandler = container.resolve("CreateOrderCommandHandler");
+const createProductHandler = container.resolve("CreateProductCommandHandler");
+
+const getCategories = async (req, res, next) => {
+  try {
+    const query = new GetCategoriesQuery();
+    const data = await getCategoriesHandler.handle(query);
+    return res.json({ data });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+const getProducts = async (req, res, next) => {
+  try {
+    const query = new GetProductsQuery();
+    const data = await getProductsHandler.handle(query);
+    return res.json({ data });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+const createProduct = async (req, res, next) => {
+  try {
+    const command = new CreateProductCommand(req.body);
+    const data = await createProductHandler.handle(command);
+    return res.status(201).json({ data });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+const createOrder = async (req, res, next) => {
+  try {
+    const command = new CreateOrderCommand(req.body);
+    const data = await createOrderHandler.handle(command);
+    return res.status(201).json({ data });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+module.exports = {
+  getCategories,
+  getProducts,
+  createProduct,
+  createOrder
+};
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Api/Controller/user.controller.js b/Frontend/1 het/backend/src/Api/Controller/user.controller.js
new file mode 100644
index 0000000..fd5e48e
--- /dev/null
+++ b/Frontend/1 het/backend/src/Api/Controller/user.controller.js	
@@ -0,0 +1,64 @@
+const RegisterUserCommand = require("../../Application/User/Command/RegisterUserCommand");
+const LoginUserCommand = require("../../Application/User/Command/LoginUserCommand");
+const LogoutUserCommand = require("../../Application/User/Command/LogoutUserCommand");
+const GetCurrentUserQuery = require("../../Application/User/Query/GetCurrentUserQuery");
+const container = require("../../Infrastructure/DI/container");
+
+const authService = container.resolve("AuthService");
+const registerHandler = container.resolve("RegisterUserCommandHandler");
+const loginHandler = container.resolve("LoginUserCommandHandler");
+const logoutHandler = container.resolve("LogoutUserCommandHandler");
+const currentUserQueryHandler = container.resolve("GetCurrentUserQueryHandler");
+
+const register = async (req, res, next) => {
+  try {
+    const command = new RegisterUserCommand(req.body);
+    const result = await registerHandler.handle(command);
+
+    res.cookie(authService.cookieName, result.token, authService.cookieOptions());
+    return res.status(201).json({ data: result.user });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+const login = async (req, res, next) => {
+  try {
+    const command = new LoginUserCommand(req.body);
+    const result = await loginHandler.handle(command);
+
+    res.cookie(authService.cookieName, result.token, authService.cookieOptions());
+    return res.json({ data: result.user });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+const me = async (req, res, next) => {
+  try {
+    const query = new GetCurrentUserQuery({ userId: req.auth.userId });
+    const result = await currentUserQueryHandler.handle(query);
+    return res.json({ data: result });
+  } catch (error) {
+    return next(error);
+  }
+};
+
+const logout = async (req, res, next) => {
+  try {
+    const command = new LogoutUserCommand({ userId: req.auth.userId });
+    await logoutHandler.handle(command);
+
+    res.clearCookie(authService.cookieName, authService.clearCookieOptions());
+    return res.status(204).send();
+  } catch (error) {
+    return next(error);
+  }
+};
+
+module.exports = {
+  register,
+  login,
+  me,
+  logout
+};
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Api/Middleware/auth.middleware.js b/Frontend/1 het/backend/src/Api/Middleware/auth.middleware.js
new file mode 100644
index 0000000..b7e18fe
--- /dev/null
+++ b/Frontend/1 het/backend/src/Api/Middleware/auth.middleware.js	
@@ -0,0 +1,20 @@
+const AuthService = require("../../Application/Services/AuthService");
+
+const authService = new AuthService();
+
+const authMiddleware = (req, res, next) => {
+  try {
+    const token = req.cookies[authService.cookieName];
+
+    if (!token) {
+      return res.status(401).json({ message: "Authentication required." });
+    }
+
+    req.auth = authService.verifyToken(token);
+    return next();
+  } catch (error) {
+    return res.status(401).json({ message: "Invalid or expired token." });
+  }
+};
+
+module.exports = authMiddleware;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Api/Middleware/errorHandler.js b/Frontend/1 het/backend/src/Api/Middleware/errorHandler.js
new file mode 100644
index 0000000..8fed651
--- /dev/null
+++ b/Frontend/1 het/backend/src/Api/Middleware/errorHandler.js	
@@ -0,0 +1,12 @@
+const errorHandler = (err, req, res, next) => {
+  if (res.headersSent) {
+    return next(err);
+  }
+
+  const status = err.statusCode || 500;
+  return res.status(status).json({
+    message: err.message || "Internal server error"
+  });
+};
+
+module.exports = errorHandler;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Api/Middleware/notFound.js b/Frontend/1 het/backend/src/Api/Middleware/notFound.js
new file mode 100644
index 0000000..8010bc3
--- /dev/null
+++ b/Frontend/1 het/backend/src/Api/Middleware/notFound.js	
@@ -0,0 +1,5 @@
+const notFound = (req, res) => {
+  res.status(404).json({ message: "Route not found" });
+};
+
+module.exports = notFound;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Api/Router/shop.router.js b/Frontend/1 het/backend/src/Api/Router/shop.router.js
new file mode 100644
index 0000000..04a0ab4
--- /dev/null
+++ b/Frontend/1 het/backend/src/Api/Router/shop.router.js	
@@ -0,0 +1,11 @@
+const express = require("express");
+const controller = require("../Controller/shop.controller");
+
+const router = express.Router();
+
+router.get("/categories", controller.getCategories);
+router.get("/products", controller.getProducts);
+router.post("/products", controller.createProduct);
+router.post("/orders", controller.createOrder);
+
+module.exports = router;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Api/Router/user.router.js b/Frontend/1 het/backend/src/Api/Router/user.router.js
new file mode 100644
index 0000000..387154c
--- /dev/null
+++ b/Frontend/1 het/backend/src/Api/Router/user.router.js	
@@ -0,0 +1,12 @@
+const express = require("express");
+const controller = require("../Controller/user.controller");
+const authMiddleware = require("../Middleware/auth.middleware");
+
+const router = express.Router();
+
+router.post("/register", controller.register);
+router.post("/login", controller.login);
+router.get("/me", authMiddleware, controller.me);
+router.post("/logout", authMiddleware, controller.logout);
+
+module.exports = router;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Api/app.js b/Frontend/1 het/backend/src/Api/app.js
new file mode 100644
index 0000000..78e58f5
--- /dev/null
+++ b/Frontend/1 het/backend/src/Api/app.js	
@@ -0,0 +1,30 @@
+const express = require("express");
+const helmet = require("helmet");
+const cors = require("cors");
+const morgan = require("morgan");
+const cookieParser = require("cookie-parser");
+
+const userRouter = require("./Router/user.router");
+const shopRouter = require("./Router/shop.router");
+const notFound = require("./Middleware/notFound");
+const errorHandler = require("./Middleware/errorHandler");
+
+const app = express();
+
+app.use(helmet());
+app.use(cors({ origin: true, credentials: true }));
+app.use(morgan("dev"));
+app.use(express.json());
+app.use(cookieParser());
+
+app.get("/api/health", (req, res) => {
+  res.json({ status: "ok", message: "CQRS backend running" });
+});
+
+app.use("/api/users", userRouter);
+app.use("/api/shop", shopRouter);
+
+app.use(notFound);
+app.use(errorHandler);
+
+module.exports = app;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Api/server.js b/Frontend/1 het/backend/src/Api/server.js
new file mode 100644
index 0000000..c07057a
--- /dev/null
+++ b/Frontend/1 het/backend/src/Api/server.js	
@@ -0,0 +1,6 @@
+const app = require("./app");
+const env = require("../config/env");
+
+app.listen(env.port, () => {
+  console.log(`Server listening on port ${env.port}`);
+});
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/DTO/UserDTO.js b/Frontend/1 het/backend/src/Application/DTO/UserDTO.js
new file mode 100644
index 0000000..a7bb5ee
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/DTO/UserDTO.js	
@@ -0,0 +1,10 @@
+class UserDTO {
+  constructor(user) {
+    this.id = user.id;
+    this.name = user.name;
+    this.email = user.email;
+    this.createdAt = user.createdAt;
+  }
+}
+
+module.exports = UserDTO;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/Services/AuthService.js b/Frontend/1 het/backend/src/Application/Services/AuthService.js
new file mode 100644
index 0000000..804c20e
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/Services/AuthService.js	
@@ -0,0 +1,37 @@
+const jwt = require("jsonwebtoken");
+const env = require("../../config/env");
+
+class AuthService {
+  constructor() {
+    this.cookieName = env.cookieName;
+  }
+
+  signToken(payload) {
+    return jwt.sign(payload, env.jwtSecret, { expiresIn: env.jwtExpiresIn });
+  }
+
+  verifyToken(token) {
+    return jwt.verify(token, env.jwtSecret);
+  }
+
+  cookieOptions() {
+    return {
+      httpOnly: true,
+      sameSite: "lax",
+      secure: env.cookieSecure,
+      path: "/",
+      maxAge: 7 * 24 * 60 * 60 * 1000
+    };
+  }
+
+  clearCookieOptions() {
+    return {
+      httpOnly: true,
+      sameSite: "lax",
+      secure: env.cookieSecure,
+      path: "/"
+    };
+  }
+}
+
+module.exports = AuthService;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/Services/PasswordService.js b/Frontend/1 het/backend/src/Application/Services/PasswordService.js
new file mode 100644
index 0000000..5e7c10b
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/Services/PasswordService.js	
@@ -0,0 +1,13 @@
+const bcrypt = require("bcryptjs");
+
+class PasswordService {
+  async hash(rawPassword) {
+    return bcrypt.hash(rawPassword, 10);
+  }
+
+  async compare(rawPassword, hash) {
+    return bcrypt.compare(rawPassword, hash);
+  }
+}
+
+module.exports = PasswordService;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/Shop/Command/CreateOrderCommand.js b/Frontend/1 het/backend/src/Application/Shop/Command/CreateOrderCommand.js
new file mode 100644
index 0000000..e8f15df
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/Shop/Command/CreateOrderCommand.js	
@@ -0,0 +1,9 @@
+class CreateOrderCommand {
+  constructor(payload) {
+    this.customer_name = payload.customer_name;
+    this.customer_email = payload.customer_email;
+    this.items = payload.items;
+  }
+}
+
+module.exports = CreateOrderCommand;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/Shop/Command/CreateOrderCommandHandler.js b/Frontend/1 het/backend/src/Application/Shop/Command/CreateOrderCommandHandler.js
new file mode 100644
index 0000000..553fa30
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/Shop/Command/CreateOrderCommandHandler.js	
@@ -0,0 +1,11 @@
+class CreateOrderCommandHandler {
+  constructor(shopRepository) {
+    this.shopRepository = shopRepository;
+  }
+
+  async handle(command) {
+    return this.shopRepository.createOrder(command);
+  }
+}
+
+module.exports = CreateOrderCommandHandler;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/Shop/Command/CreateProductCommand.js b/Frontend/1 het/backend/src/Application/Shop/Command/CreateProductCommand.js
new file mode 100644
index 0000000..52e78af
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/Shop/Command/CreateProductCommand.js	
@@ -0,0 +1,12 @@
+class CreateProductCommand {
+  constructor(payload) {
+    this.category_id = payload.category_id;
+    this.name = payload.name;
+    this.description = payload.description;
+    this.price = payload.price;
+    this.image_url = payload.image_url;
+    this.stock = payload.stock;
+  }
+}
+
+module.exports = CreateProductCommand;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/Shop/Command/CreateProductCommandHandler.js b/Frontend/1 het/backend/src/Application/Shop/Command/CreateProductCommandHandler.js
new file mode 100644
index 0000000..9bba82b
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/Shop/Command/CreateProductCommandHandler.js	
@@ -0,0 +1,11 @@
+class CreateProductCommandHandler {
+  constructor(shopRepository) {
+    this.shopRepository = shopRepository;
+  }
+
+  async handle(command) {
+    return this.shopRepository.createProduct(command);
+  }
+}
+
+module.exports = CreateProductCommandHandler;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/Shop/Query/GetCategoriesQuery.js b/Frontend/1 het/backend/src/Application/Shop/Query/GetCategoriesQuery.js
new file mode 100644
index 0000000..c0a710b
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/Shop/Query/GetCategoriesQuery.js	
@@ -0,0 +1,3 @@
+class GetCategoriesQuery {}
+
+module.exports = GetCategoriesQuery;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/Shop/Query/GetCategoriesQueryHandler.js b/Frontend/1 het/backend/src/Application/Shop/Query/GetCategoriesQueryHandler.js
new file mode 100644
index 0000000..3321ad7
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/Shop/Query/GetCategoriesQueryHandler.js	
@@ -0,0 +1,11 @@
+class GetCategoriesQueryHandler {
+  constructor(shopRepository) {
+    this.shopRepository = shopRepository;
+  }
+
+  async handle() {
+    return this.shopRepository.findCategories();
+  }
+}
+
+module.exports = GetCategoriesQueryHandler;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/Shop/Query/GetProductsQuery.js b/Frontend/1 het/backend/src/Application/Shop/Query/GetProductsQuery.js
new file mode 100644
index 0000000..1e80020
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/Shop/Query/GetProductsQuery.js	
@@ -0,0 +1,3 @@
+class GetProductsQuery {}
+
+module.exports = GetProductsQuery;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/Shop/Query/GetProductsQueryHandler.js b/Frontend/1 het/backend/src/Application/Shop/Query/GetProductsQueryHandler.js
new file mode 100644
index 0000000..ae348e3
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/Shop/Query/GetProductsQueryHandler.js	
@@ -0,0 +1,11 @@
+class GetProductsQueryHandler {
+  constructor(shopRepository) {
+    this.shopRepository = shopRepository;
+  }
+
+  async handle() {
+    return this.shopRepository.findProducts();
+  }
+}
+
+module.exports = GetProductsQueryHandler;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/User/Command/LoginUserCommand.js b/Frontend/1 het/backend/src/Application/User/Command/LoginUserCommand.js
new file mode 100644
index 0000000..af85a39
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/User/Command/LoginUserCommand.js	
@@ -0,0 +1,8 @@
+class LoginUserCommand {
+  constructor(payload) {
+    this.email = payload.email;
+    this.password = payload.password;
+  }
+}
+
+module.exports = LoginUserCommand;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/User/Command/LoginUserCommandHandler.js b/Frontend/1 het/backend/src/Application/User/Command/LoginUserCommandHandler.js
new file mode 100644
index 0000000..39cdab1
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/User/Command/LoginUserCommandHandler.js	
@@ -0,0 +1,37 @@
+const PasswordService = require("../../Services/PasswordService");
+const UserDTO = require("../../DTO/UserDTO");
+
+class LoginUserCommandHandler {
+  constructor(userRepository, authService) {
+    this.userRepository = userRepository;
+    this.authService = authService;
+    this.passwordService = new PasswordService();
+  }
+
+  async handle(command) {
+    if (!command.email || !command.password) {
+      const error = new Error("email and password are required");
+      error.statusCode = 400;
+      throw error;
+    }
+
+    const user = await this.userRepository.findByEmail(command.email);
+    if (!user) {
+      const error = new Error("Invalid credentials");
+      error.statusCode = 401;
+      throw error;
+    }
+
+    const isValid = await this.passwordService.compare(command.password, user.passwordHash);
+    if (!isValid) {
+      const error = new Error("Invalid credentials");
+      error.statusCode = 401;
+      throw error;
+    }
+
+    const token = this.authService.signToken({ userId: user.id, email: user.email });
+    return { user: new UserDTO(user), token };
+  }
+}
+
+module.exports = LoginUserCommandHandler;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/User/Command/LogoutUserCommand.js b/Frontend/1 het/backend/src/Application/User/Command/LogoutUserCommand.js
new file mode 100644
index 0000000..42d13f0
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/User/Command/LogoutUserCommand.js	
@@ -0,0 +1,7 @@
+class LogoutUserCommand {
+  constructor(payload) {
+    this.userId = payload.userId;
+  }
+}
+
+module.exports = LogoutUserCommand;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/User/Command/LogoutUserCommandHandler.js b/Frontend/1 het/backend/src/Application/User/Command/LogoutUserCommandHandler.js
new file mode 100644
index 0000000..f23c919
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/User/Command/LogoutUserCommandHandler.js	
@@ -0,0 +1,11 @@
+class LogoutUserCommandHandler {
+  async handle(command) {
+    if (!command.userId) {
+      const error = new Error("Unauthorized");
+      error.statusCode = 401;
+      throw error;
+    }
+  }
+}
+
+module.exports = LogoutUserCommandHandler;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/User/Command/RegisterUserCommand.js b/Frontend/1 het/backend/src/Application/User/Command/RegisterUserCommand.js
new file mode 100644
index 0000000..f42219d
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/User/Command/RegisterUserCommand.js	
@@ -0,0 +1,9 @@
+class RegisterUserCommand {
+  constructor(payload) {
+    this.name = payload.name;
+    this.email = payload.email;
+    this.password = payload.password;
+  }
+}
+
+module.exports = RegisterUserCommand;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/User/Command/RegisterUserCommandHandler.js b/Frontend/1 het/backend/src/Application/User/Command/RegisterUserCommandHandler.js
new file mode 100644
index 0000000..1ad7dda
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/User/Command/RegisterUserCommandHandler.js	
@@ -0,0 +1,37 @@
+const PasswordService = require("../../Services/PasswordService");
+const UserDTO = require("../../DTO/UserDTO");
+
+class RegisterUserCommandHandler {
+  constructor(userRepository, authService) {
+    this.userRepository = userRepository;
+    this.authService = authService;
+    this.passwordService = new PasswordService();
+  }
+
+  async handle(command) {
+    if (!command.name || !command.email || !command.password) {
+      const error = new Error("name, email and password are required");
+      error.statusCode = 400;
+      throw error;
+    }
+
+    const existing = await this.userRepository.findByEmail(command.email);
+    if (existing) {
+      const error = new Error("Email already in use");
+      error.statusCode = 409;
+      throw error;
+    }
+
+    const passwordHash = await this.passwordService.hash(command.password);
+    const user = await this.userRepository.create({
+      name: command.name,
+      email: command.email,
+      passwordHash
+    });
+
+    const token = this.authService.signToken({ userId: user.id, email: user.email });
+    return { user: new UserDTO(user), token };
+  }
+}
+
+module.exports = RegisterUserCommandHandler;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/User/Query/GetCurrentUserQuery.js b/Frontend/1 het/backend/src/Application/User/Query/GetCurrentUserQuery.js
new file mode 100644
index 0000000..6e9b2e8
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/User/Query/GetCurrentUserQuery.js	
@@ -0,0 +1,7 @@
+class GetCurrentUserQuery {
+  constructor(payload) {
+    this.userId = payload.userId;
+  }
+}
+
+module.exports = GetCurrentUserQuery;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Application/User/Query/GetCurrentUserQueryHandler.js b/Frontend/1 het/backend/src/Application/User/Query/GetCurrentUserQueryHandler.js
new file mode 100644
index 0000000..7d6c948
--- /dev/null
+++ b/Frontend/1 het/backend/src/Application/User/Query/GetCurrentUserQueryHandler.js	
@@ -0,0 +1,26 @@
+const UserDTO = require("../../DTO/UserDTO");
+
+class GetCurrentUserQueryHandler {
+  constructor(userRepository) {
+    this.userRepository = userRepository;
+  }
+
+  async handle(query) {
+    if (!query.userId) {
+      const error = new Error("Unauthorized");
+      error.statusCode = 401;
+      throw error;
+    }
+
+    const user = await this.userRepository.findById(query.userId);
+    if (!user) {
+      const error = new Error("User not found");
+      error.statusCode = 404;
+      throw error;
+    }
+
+    return new UserDTO(user);
+  }
+}
+
+module.exports = GetCurrentUserQueryHandler;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Domain/IRepository/IUserRepository.js b/Frontend/1 het/backend/src/Domain/IRepository/IUserRepository.js
new file mode 100644
index 0000000..e5d7a32
--- /dev/null
+++ b/Frontend/1 het/backend/src/Domain/IRepository/IUserRepository.js	
@@ -0,0 +1,15 @@
+class IUserRepository {
+  async findById(_id) {
+    throw new Error("Method not implemented");
+  }
+
+  async findByEmail(_email) {
+    throw new Error("Method not implemented");
+  }
+
+  async create(_data) {
+    throw new Error("Method not implemented");
+  }
+}
+
+module.exports = IUserRepository;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Domain/Models/User.js b/Frontend/1 het/backend/src/Domain/Models/User.js
new file mode 100644
index 0000000..5d578a7
--- /dev/null
+++ b/Frontend/1 het/backend/src/Domain/Models/User.js	
@@ -0,0 +1,11 @@
+class User {
+  constructor({ id, name, email, passwordHash, createdAt }) {
+    this.id = id;
+    this.name = name;
+    this.email = email;
+    this.passwordHash = passwordHash;
+    this.createdAt = createdAt;
+  }
+}
+
+module.exports = User;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Infrastructure/DI/DIContainer.js b/Frontend/1 het/backend/src/Infrastructure/DI/DIContainer.js
new file mode 100644
index 0000000..4116a85
--- /dev/null
+++ b/Frontend/1 het/backend/src/Infrastructure/DI/DIContainer.js	
@@ -0,0 +1,32 @@
+class DIContainer {
+  constructor() {
+    this.registry = new Map();
+    this.singletons = new Map();
+  }
+
+  registerSingleton(token, factory) {
+    this.registry.set(token, { factory, lifetime: "singleton" });
+  }
+
+  registerTransient(token, factory) {
+    this.registry.set(token, { factory, lifetime: "transient" });
+  }
+
+  resolve(token) {
+    const entry = this.registry.get(token);
+    if (!entry) {
+      throw new Error(`Dependency not registered: ${token}`);
+    }
+
+    if (entry.lifetime === "singleton") {
+      if (!this.singletons.has(token)) {
+        this.singletons.set(token, entry.factory(this));
+      }
+      return this.singletons.get(token);
+    }
+
+    return entry.factory(this);
+  }
+}
+
+module.exports = DIContainer;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Infrastructure/DI/container.js b/Frontend/1 het/backend/src/Infrastructure/DI/container.js
new file mode 100644
index 0000000..899c49b
--- /dev/null
+++ b/Frontend/1 het/backend/src/Infrastructure/DI/container.js	
@@ -0,0 +1,57 @@
+const DIContainer = require("./DIContainer");
+
+const AuthService = require("../../Application/Services/AuthService");
+
+const UserPrismaRepository = require("../Repository/UserPrismaRepository");
+const ShopPrismaRepository = require("../Repository/ShopPrismaRepository");
+
+const RegisterUserCommandHandler = require("../../Application/User/Command/RegisterUserCommandHandler");
+const LoginUserCommandHandler = require("../../Application/User/Command/LoginUserCommandHandler");
+const LogoutUserCommandHandler = require("../../Application/User/Command/LogoutUserCommandHandler");
+const GetCurrentUserQueryHandler = require("../../Application/User/Query/GetCurrentUserQueryHandler");
+
+const GetCategoriesQueryHandler = require("../../Application/Shop/Query/GetCategoriesQueryHandler");
+const GetProductsQueryHandler = require("../../Application/Shop/Query/GetProductsQueryHandler");
+const CreateProductCommandHandler = require("../../Application/Shop/Command/CreateProductCommandHandler");
+const CreateOrderCommandHandler = require("../../Application/Shop/Command/CreateOrderCommandHandler");
+
+const container = new DIContainer();
+
+container.registerSingleton("AuthService", () => new AuthService());
+
+container.registerSingleton("UserRepository", () => new UserPrismaRepository());
+container.registerSingleton("ShopRepository", () => new ShopPrismaRepository());
+
+container.registerSingleton("RegisterUserCommandHandler", (c) => {
+  return new RegisterUserCommandHandler(c.resolve("UserRepository"), c.resolve("AuthService"));
+});
+
+container.registerSingleton("LoginUserCommandHandler", (c) => {
+  return new LoginUserCommandHandler(c.resolve("UserRepository"), c.resolve("AuthService"));
+});
+
+container.registerSingleton("LogoutUserCommandHandler", () => {
+  return new LogoutUserCommandHandler();
+});
+
+container.registerSingleton("GetCurrentUserQueryHandler", (c) => {
+  return new GetCurrentUserQueryHandler(c.resolve("UserRepository"));
+});
+
+container.registerSingleton("GetCategoriesQueryHandler", (c) => {
+  return new GetCategoriesQueryHandler(c.resolve("ShopRepository"));
+});
+
+container.registerSingleton("GetProductsQueryHandler", (c) => {
+  return new GetProductsQueryHandler(c.resolve("ShopRepository"));
+});
+
+container.registerSingleton("CreateProductCommandHandler", (c) => {
+  return new CreateProductCommandHandler(c.resolve("ShopRepository"));
+});
+
+container.registerSingleton("CreateOrderCommandHandler", (c) => {
+  return new CreateOrderCommandHandler(c.resolve("ShopRepository"));
+});
+
+module.exports = container;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Infrastructure/Repository/ShopPrismaRepository.js b/Frontend/1 het/backend/src/Infrastructure/Repository/ShopPrismaRepository.js
new file mode 100644
index 0000000..7305b70
--- /dev/null
+++ b/Frontend/1 het/backend/src/Infrastructure/Repository/ShopPrismaRepository.js	
@@ -0,0 +1,126 @@
+const prisma = require("../../config/prisma");
+
+class ShopPrismaRepository {
+  async findCategories() {
+    return prisma.category.findMany({ orderBy: { name: "asc" } });
+  }
+
+  async findProducts() {
+    return prisma.product.findMany({
+      include: {
+        category: true
+      },
+      orderBy: { id: "asc" }
+    });
+  }
+
+  async createProduct(payload) {
+    const categoryId = Number(payload.category_id);
+    const stock = payload.stock == null ? 0 : Number(payload.stock);
+    const price = Number(payload.price);
+
+    if (Number.isNaN(categoryId) || !payload.name || Number.isNaN(price) || Number.isNaN(stock)) {
+      const error = new Error("category_id, name, price and stock are required");
+      error.statusCode = 400;
+      throw error;
+    }
+
+    if (price < 0 || stock < 0) {
+      const error = new Error("price and stock must be >= 0");
+      error.statusCode = 400;
+      throw error;
+    }
+
+    const category = await prisma.category.findUnique({ where: { id: categoryId } });
+    if (!category) {
+      const error = new Error("Category not found");
+      error.statusCode = 404;
+      throw error;
+    }
+
+    return prisma.product.create({
+      data: {
+        categoryId,
+        name: payload.name,
+        description: payload.description || null,
+        price,
+        imageUrl: payload.image_url || null,
+        stock
+      },
+      include: {
+        category: true
+      }
+    });
+  }
+
+  async createOrder(payload) {
+    const { customer_name: customerName, customer_email: customerEmail, items } = payload;
+
+    if (!customerName || !customerEmail || !Array.isArray(items) || items.length === 0) {
+      const error = new Error("customer_name, customer_email and items are required");
+      error.statusCode = 400;
+      throw error;
+    }
+
+    return prisma.$transaction(async (tx) => {
+      let totalPrice = 0;
+      const orderItems = [];
+
+      for (const item of items) {
+        const productId = Number(item.product_id);
+        const quantity = Number(item.quantity);
+
+        if (Number.isNaN(productId) || Number.isNaN(quantity) || quantity <= 0) {
+          const error = new Error("Each item needs product_id and quantity > 0");
+          error.statusCode = 400;
+          throw error;
+        }
+
+        const product = await tx.product.findUnique({ where: { id: productId } });
+        if (!product) {
+          const error = new Error(`Product ${productId} not found`);
+          error.statusCode = 404;
+          throw error;
+        }
+
+        if (product.stock < quantity) {
+          const error = new Error(`Not enough stock for product ${product.name}`);
+          error.statusCode = 400;
+          throw error;
+        }
+
+        totalPrice += Number(product.price) * quantity;
+        orderItems.push({ product, quantity });
+      }
+
+      const order = await tx.order.create({
+        data: {
+          customerName,
+          customerEmail,
+          totalPrice,
+          items: {
+            create: orderItems.map((entry) => ({
+              productId: entry.product.id,
+              quantity: entry.quantity,
+              unitPrice: entry.product.price
+            }))
+          }
+        },
+        include: {
+          items: true
+        }
+      });
+
+      for (const entry of orderItems) {
+        await tx.product.update({
+          where: { id: entry.product.id },
+          data: { stock: entry.product.stock - entry.quantity }
+        });
+      }
+
+      return order;
+    });
+  }
+}
+
+module.exports = ShopPrismaRepository;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/Infrastructure/Repository/UserPrismaRepository.js b/Frontend/1 het/backend/src/Infrastructure/Repository/UserPrismaRepository.js
new file mode 100644
index 0000000..fd6e741
--- /dev/null
+++ b/Frontend/1 het/backend/src/Infrastructure/Repository/UserPrismaRepository.js	
@@ -0,0 +1,29 @@
+const prisma = require("../../config/prisma");
+const IUserRepository = require("../../Domain/IRepository/IUserRepository");
+const User = require("../../Domain/Models/User");
+
+class UserPrismaRepository extends IUserRepository {
+  async findById(id) {
+    const user = await prisma.user.findUnique({ where: { id: Number(id) } });
+    return user ? new User(user) : null;
+  }
+
+  async findByEmail(email) {
+    const user = await prisma.user.findUnique({ where: { email: email.toLowerCase() } });
+    return user ? new User(user) : null;
+  }
+
+  async create(data) {
+    const user = await prisma.user.create({
+      data: {
+        name: data.name,
+        email: data.email.toLowerCase(),
+        passwordHash: data.passwordHash
+      }
+    });
+
+    return new User(user);
+  }
+}
+
+module.exports = UserPrismaRepository;
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/config/env.js b/Frontend/1 het/backend/src/config/env.js
new file mode 100644
index 0000000..0de11d2
--- /dev/null
+++ b/Frontend/1 het/backend/src/config/env.js	
@@ -0,0 +1,14 @@
+const path = require("path");
+const dotenv = require("dotenv");
+
+dotenv.config({ path: path.resolve(process.cwd(), ".env") });
+
+module.exports = {
+  port: Number(process.env.PORT || 3000),
+  nodeEnv: process.env.NODE_ENV || "development",
+  databaseUrl: process.env.DATABASE_URL,
+  jwtSecret: process.env.JWT_SECRET || "dev-secret",
+  jwtExpiresIn: process.env.JWT_EXPIRES_IN || "7d",
+  cookieName: process.env.COOKIE_NAME || "webstore_token",
+  cookieSecure: process.env.COOKIE_SECURE === "true"
+};
\ No newline at end of file
diff --git a/Frontend/1 het/backend/src/config/prisma.js b/Frontend/1 het/backend/src/config/prisma.js
new file mode 100644
index 0000000..05898df
--- /dev/null
+++ b/Frontend/1 het/backend/src/config/prisma.js	
@@ -0,0 +1,5 @@
+const { PrismaClient } = require("@prisma/client");
+
+const prisma = new PrismaClient();
+
+module.exports = prisma;
\ No newline at end of file
diff --git a/TypeScript_ppt/common/it_logo.pdf b/TypeScript_ppt/common/it_logo.pdf
new file mode 100644
index 0000000..dde9932
Binary files /dev/null and b/TypeScript_ppt/common/it_logo.pdf differ
diff --git a/TypeScript_ppt/common/sze_logo.pdf b/TypeScript_ppt/common/sze_logo.pdf
new file mode 100644
index 0000000..cbf22f9
Binary files /dev/null and b/TypeScript_ppt/common/sze_logo.pdf differ
diff --git a/TypeScript_ppt/common/webfejl.sty b/TypeScript_ppt/common/webfejl.sty
new file mode 100644
index 0000000..de69502
--- /dev/null
+++ b/TypeScript_ppt/common/webfejl.sty
@@ -0,0 +1,230 @@
+\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage[magyar]{babel}
+\usepackage{indentfirst}
+\usepackage{graphicx}
+\usepackage{tikz}
+\usetikzlibrary{positioning}
+\usepackage{fancyvrb}
+\usepackage{amssymb}
+\usepackage{pifont}
+\usepackage{newunicodechar}
+
+% Unicode szimbólumok definiálása
+\newcommand{\cmark}{\ding{51}}  % ✓ check mark
+\newcommand{\xmark}{\ding{55}}  % ✗ ballot x
+\newunicodechar{✓}{\cmark}
+\newunicodechar{✗}{\xmark}
+\newunicodechar{❌}{\textcolor{red}{\xmark}}
+
+% Globális verbatim beállítás - tiny betűméret minden verbatim blokkhoz
+\fvset{fontsize=\tiny}
+\usepackage{listingsutf8}
+\usepackage{textcomp}
+\usepackage{eurosym}
+\usepackage{mathtools}
+\lstset{literate=
+  {á}{{\'a}}1 {é}{{\'e}}1 {í}{{\'i}}1 {ó}{{\'o}}1 {ú}{{\'u}}1
+  {Á}{{\'A}}1 {É}{{\'E}}1 {Í}{{\'I}}1 {Ó}{{\'O}}1 {Ú}{{\'U}}1
+  {à}{{\`a}}1 {è}{{\`e}}1 {ì}{{\`i}}1 {ò}{{\`o}}1 {ù}{{\`u}}1
+  {À}{{\`A}}1 {È}{{\'E}}1 {Ì}{{\`I}}1 {Ò}{{\`O}}1 {Ù}{{\`U}}1
+  {ä}{{\"a}}1 {ë}{{\"e}}1 {ï}{{\"i}}1 {ö}{{\"o}}1 {ü}{{\"u}}1
+  {Ä}{{\"A}}1 {Ë}{{\"E}}1 {Ï}{{\"I}}1 {Ö}{{\"O}}1 {Ü}{{\"U}}1
+  {â}{{\^a}}1 {ê}{{\^e}}1 {î}{{\^i}}1 {ô}{{\^o}}1 {û}{{\^u}}1
+  {Â}{{\^A}}1 {Ê}{{\^E}}1 {Î}{{\^I}}1 {Ô}{{\^O}}1 {Û}{{\^U}}1
+  {œ}{{\oe}}1 {Œ}{{\OE}}1 {æ}{{\ae}}1 {Æ}{{\AE}}1 {ß}{{\ss}}1
+  {ç}{{\c c}}1 {Ç}{{\c C}}1 {ø}{{\o}}1 {å}{{\r a}}1 {Å}{{\r A}}1
+  {€}{{\EUR}}1 {£}{{\pounds}}1 {ő}{{\H{o}}}1 {ű}{{\H{u}}}1
+}
+% Docker nyelvdefiníció
+\lstdefinelanguage{Docker}{
+  keywords={FROM, RUN, CMD, LABEL, MAINTAINER, EXPOSE, ENV, ADD, COPY, 
+    ENTRYPOINT, VOLUME, USER, WORKDIR, ARG, ONBUILD, STOPSIGNAL, 
+    HEALTHCHECK, SHELL, AS},
+  keywordstyle=\color{blue}\bfseries,
+  identifierstyle=\color{black},
+  sensitive=false,
+  comment=[l]{\#},
+  commentstyle=\color{purple}\ttfamily,
+  stringstyle=\color{red}\ttfamily,
+  morestring=[b]',
+  morestring=[b]"
+}
+
+% JavaScript nyelvdefiníció
+\lstdefinelanguage{JavaScript}{
+  keywords={typeof, new, true, false, catch, function, return, null, catch, 
+    switch, var, const, let, if, in, while, do, else, case, break, async, 
+    await, class, export, import, extends, super, this, throw, try, default},
+  keywordstyle=\color{blue}\bfseries,
+  ndkeywords={class, export, boolean, throw, implements, import, this},
+  ndkeywordstyle=\color{darkgray}\bfseries,
+  identifierstyle=\color{black},
+  sensitive=false,
+  comment=[l]{//},
+  morecomment=[s]{/*}{*/},
+  commentstyle=\color{purple}\ttfamily,
+  stringstyle=\color{red}\ttfamily,
+  morestring=[b]',
+  morestring=[b]"
+}
+
+% YAML nyelvdefiníció
+\lstdefinelanguage{yaml}{
+  keywords={true,false,null,y,n},
+  keywordstyle=\color{darkgray}\bfseries,
+  sensitive=false,
+  comment=[l]{\#},
+  commentstyle=\color{purple}\ttfamily,
+  stringstyle=\color{red}\ttfamily,
+  morestring=[b]',
+  morestring=[b]",
+  basicstyle=\ttfamily\scriptsize,
+  breaklines=true,
+  columns=fullflexible,
+  keepspaces=true,
+  showstringspaces=false
+}
+
+\lstdefinestyle{HTML}{
+  language=HTML,
+  breaklines=true,
+  postbreak=\mbox{\textcolor{red}{$\hookrightarrow$}\space},
+  stringstyle=\ttfamily,
+  inputencoding=utf8,
+  morekeywords={header, time, nav, main, article, section, aside, role, 
+    footer, details, open, summary, srcdoc, list, datalist, placeholder, 
+    pattern, required, min, max, step, enctype, formaction, formmethod, 
+    formnovalidate, formtarget, output}
+}
+
+\lstdefinestyle{JavaScript}{
+  basicstyle=\ttfamily\scriptsize,
+  breaklines=true,
+  columns=fullflexible,
+  keepspaces=true,
+  showstringspaces=false,
+  literate={}
+}
+\lstdefinestyle{NodeJS}{
+  basicstyle=\ttfamily\scriptsize,
+  breaklines=true,
+  columns=fullflexible,
+  keepspaces=true,
+  showstringspaces=false,
+  literate={}
+}
+\lstdefinestyle{Express}{
+  basicstyle=\ttfamily\scriptsize,
+  breaklines=true,
+  columns=fullflexible,
+  keepspaces=true,
+  showstringspaces=false,
+  literate={}
+}
+\lstdefinestyle{Prisma}{
+  basicstyle=\ttfamily\scriptsize,
+  breaklines=true,
+  columns=fullflexible,
+  keepspaces=true,
+  showstringspaces=false,
+  literate={}
+}
+\usepackage{hyperref}
+\usepackage{attachfile}
+\usepackage{multirow}
+% Navigációs pöttyök hozzáadása subsection nélküli fejezetekhez
+\usepackage{remreset}
+\makeatletter
+\@removefromreset{subsection}{section}
+\makeatother
+\setcounter{subsection}{1}
+%%%%%
+\attachfilesetup{color={1.0 0.6 0.0},author={MD},description={Kattintson duplán a minta %
+megtekintéséhez!},icon=Paperclip}
+% Széchenyi Egyetem arculati színek
+\definecolor{szenavy}{RGB}{44,62,80}        % Sötét kék (fejléc)
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+\definecolor{szezold}{RGB}{139,195,74}      % Élénk zöld (akcentus)
+\definecolor{szeszurke}{RGB}{96,96,96}      % Sötét szürke
+% Kompatibilitás a régi parancsokkal
+\definecolor{kiemelesszin}{RGB}{0,168,225}  % Kék kiemelés (szecyan)
+\definecolor{kiemelesszinZ}{RGB}{139,195,74} % Zöld kiemelés (szezold)
+\definecolor{kiemelesszinN}{RGB}{44,62,80}  % Navy kiemelés (szenavy)
+\definecolor{hivatkozasszin}{RGB}{0,168,225} % Kék hivatkozás
+\newcommand{\kiemel}[1]{{\color{kiemelesszin}#1}}
+\newcommand{\kiemelZ}[1]{{\color{kiemelesszinZ}#1}}
+\newcommand{\kiemelN}[1]{{\color{kiemelesszinN}#1}}
+\newcommand{\hiv}[1]{{\color{hivatkozasszin}#1}}
+\newcommand{\logoalul}{
+  \begin{picture}(0,0)
+    \put(120,-0){\hbox{\includegraphics[scale=.5]{./common/sze_logo.pdf}}}
+    \put(205,-6){\hbox{\includegraphics[scale=.4]{./common/it_logo.pdf}}}
+  \end{picture}
+}
+
+\frenchspacing
+\usetheme[compress]{Berlin}
+\useoutertheme[subsection=false]{miniframes}
+\setbeamerfont{section in head/foot}{size=\tiny}
+\setbeamerfont{subsection in head/foot}{size=\tiny}
+
+% Adaptív, kattintható navigáció:
+% sok section esetén az aktuális marad nagy és szöveges,
+% a többi section lekicsinyített sorszámként jelenik meg.
+\newcommand{\sectioncompactthreshold}{11}
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+\providecommand{\totalsectionscount}{0}
+\AtEndDocument{%
+  \immediate\write\@auxout{\string\gdef\string\totalsectionscount{\arabic{section}}}%
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+
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+  {\fontsize{6}{7}\selectfont\bfseries\insertsectionhead}%
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+  \leavevmode%
+  \hbox{%
+  \begin{beamercolorbox}[wd=\paperwidth,ht=2.5ex,dp=1.125ex]{section in head/foot}%
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+  \end{beamercolorbox}%
+  }
+  \vskip0pt%
+}
+
+% Kisebb betűméret a slide-okhoz
+\setbeamerfont{frametitle}{size=\normalsize}
+\setbeamerfont{framesubtitle}{size=\small}
+\setbeamerfont{block title}{size=\small}
+\setbeamerfont{block body}{size=\footnotesize}
+\setbeamerfont{itemize/enumerate body}{size=\footnotesize}
+\setbeamerfont{itemize/enumerate subbody}{size=\scriptsize}
+
+% Beamer színséma testreszabása Széchenyi arculathoz
+\setbeamercolor{structure}{fg=szecyan}
+\setbeamercolor{palette primary}{bg=szenavy,fg=white}
+\setbeamercolor{palette secondary}{bg=szecyan,fg=white}
+\setbeamercolor{palette tertiary}{bg=szezold,fg=white}
+\setbeamercolor{palette quaternary}{bg=szeszurke,fg=white}
+\setbeamercolor{titlelike}{parent=palette primary}
+\setbeamercolor{frametitle}{bg=szenavy,fg=white}
+\setbeamercolor{frametitle right}{bg=szenavy}
+\setbeamercolor{block title}{bg=szecyan,fg=white}
+\setbeamercolor{block body}{bg=szecyan!10,fg=black}
+\setbeamercolor{block title alerted}{bg=szezold,fg=white}
+\setbeamercolor{block body alerted}{bg=szezold!10,fg=black}
+\setbeamercolor{item}{fg=szecyan}
+\setbeamercolor{subitem}{fg=szezold}
+
+\author{Magda Donát}
+\institute{Széchenyi István Egyetem, Győr}
+\date{\hiv{\href{https://git.mdnd-it.cc/Donat/GKNB_MSTM071}{https://git.mdnd-it.cc/Donat/GKNB_MSTM071}}\\ \today}
diff --git a/TypeScript_ppt/sections/01_intro_and_setup.tex b/TypeScript_ppt/sections/01_intro_and_setup.tex
new file mode 100644
index 0000000..5a9aac9
--- /dev/null
+++ b/TypeScript_ppt/sections/01_intro_and_setup.tex
@@ -0,0 +1,86 @@
+\section{Alapok}
+
+\begin{frame}[fragile]{Mi a TypeScript?}
+\begin{itemize}
+  \item A TypeScript a JavaScript \kiemel{típusos kiterjesztése}.
+  \item Fejlesztés közben jelez hibákat, mielőtt futna a kód.
+  \item A fordítás után sima JavaScript fut a böngészőben vagy Node.js alatt.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Hogyan gondolkodj róla kezdőként?}
+\begin{itemize}
+  \item A JavaScript megmondja, \kiemel{hogyan} fusson a program.
+  \item A TypeScript megmutatja, \kiemel{milyen adatokkal} futhat biztonságosan.
+  \item A típusok dokumentációként is működnek, így a következő fejlesztő gyorsabban megérti a kódot.
+  \item A cél nem a bonyolult típusok gyártása, hanem a hibák korai kiszűrése.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Miért jó kezdőknek?}
+\begin{itemize}
+  \item Könnyebb megérteni, milyen adatot vár egy függvény.
+  \item Biztonságosabb a refaktorálás.
+  \item Jobb IDE-támogatást kapsz (autocomplete, hibajelzések).
+  \item Kisebb az esélye a futásidejű meglepetéseknek.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Mire figyelj a tanulás elején?}
+\begin{itemize}
+  \item Először a JavaScript alapokat erősítsd meg: változók, függvények, objektumok, tömbök.
+  \item Utána vezesd be a TypeScriptet kis lépésekben: előbb paraméter- és visszatérési típusokkal.
+  \item Ne használd túl korán az any típust, mert ezzel elveszíted a TypeScript fő előnyét.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Telepítés és első projekt}
+\begin{lstlisting}[style=NodeJS]
+mkdir ts-course
+cd ts-course
+npm init -y
+npm install -D typescript ts-node @types/node
+npx tsc --init
+\end{lstlisting}
+\end{frame}
+
+\begin{frame}[fragile]{Egyszerű tsconfig.json}
+\begin{lstlisting}[style=JavaScript]
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "strict": true,
+    "rootDir": "src",
+    "outDir": "dist",
+    "esModuleInterop": true
+  },
+  "include": ["src"]
+}
+\end{lstlisting}
+\begin{itemize}
+  \item strict: szigorúbb ellenőrzés, kevesebb rejtett hiba.
+  \item rootDir/outDir: tisztán elválasztja a forráskódot és a fordított kódot.
+  \item module NodeNext: modern ES-modulok Node környezetben.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Első TypeScript-kód}
+\begin{lstlisting}[style=JavaScript]
+// src/index.ts
+function greet(name: string): string {
+  return `Hello, ${name}!`;
+}
+
+console.log(greet("TypeScript"));
+\end{lstlisting}
+\begin{lstlisting}[style=NodeJS]
+npx tsc
+node dist/index.js
+\end{lstlisting}
+\begin{itemize}
+  \item Először a tsc fordító fut le, ez ellenőrzi a típusokat.
+  \item Ezután már JavaScript fut, vagyis a végrehajtás mindig JS-ben történik.
+\end{itemize}
+\end{frame}
diff --git a/TypeScript_ppt/sections/02_basic_types.tex b/TypeScript_ppt/sections/02_basic_types.tex
new file mode 100644
index 0000000..0858e7e
--- /dev/null
+++ b/TypeScript_ppt/sections/02_basic_types.tex
@@ -0,0 +1,63 @@
+\section{Típusok}
+
+\begin{frame}[fragile]{Primitív típusok}
+\begin{lstlisting}[style=JavaScript]
+let userName: string = "Anna";
+let age: number = 20;
+let isStudent: boolean = true;
+let value: null = null;
+let missing: undefined = undefined;
+\end{lstlisting}
+\begin{itemize}
+  \item Ezek a legalapvetőbb építőelemek, minden összetettebb típus ezekre épül.
+  \item A null és undefined kezelése kulcsfontosságú a stabil alkalmazásokhoz.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Típusinferencia}
+\begin{lstlisting}[style=JavaScript]
+let city = "Gyor"; // string
+let points = 10;    // number
+const role = "admin"; // "admin" literal
+\end{lstlisting}
+\begin{itemize}
+  \item Nem kell mindig kiírni a típust.
+  \item Akkor érdemes explicit típust adni, ha nő tőle az olvashatóság.
+  \item Jó egyensúly: ahol egyértelmű, hagyd inferálni; ahol kétértelmű, írj explicit típust.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Tömbök és tuple}
+\begin{lstlisting}[style=JavaScript]
+const nums: number[] = [1, 2, 3];
+const tags: Array<string> = ["ts", "js"];
+
+const point: [number, number] = [10, 20];
+const personRow: [id: number, name: string] = [1, "Bela"];
+\end{lstlisting}
+\begin{itemize}
+  \item Tömb: tetszőleges elemszám, azonos elemtípus.
+  \item Tuple: fix elemszám, pozíciónként meghatározott típus.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Objektumtípusok}
+\begin{lstlisting}[style=JavaScript]
+const user: { id: number; name: string; active: boolean } = {
+  id: 1,
+  name: "Kata",
+  active: true,
+};
+\end{lstlisting}
+\begin{itemize}
+  \item Objektumoknál a típus gyorsan hosszúvá válhat, ezért a következő lépés a type/interface használata.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Tipikus kezdő hibák típusoknál}
+\begin{itemize}
+  \item Összekeverni a number és string értékeket (pl. "10" + 5).
+  \item Elfelejteni, hogy a const literál-típust is adhat.
+  \item Nem kezelni a null lehetőségét külső adatoknál.
+\end{itemize}
+\end{frame}
diff --git a/TypeScript_ppt/sections/03_functions_and_unions.tex b/TypeScript_ppt/sections/03_functions_and_unions.tex
new file mode 100644
index 0000000..7e50604
--- /dev/null
+++ b/TypeScript_ppt/sections/03_functions_and_unions.tex
@@ -0,0 +1,69 @@
+\section{Függvények}
+
+\begin{frame}[fragile]{Függvénytípusok}
+\begin{lstlisting}[style=JavaScript]
+function add(a: number, b: number): number {
+  return a + b;
+}
+
+const multiply = (a: number, b: number): number => a * b;
+\end{lstlisting}
+\begin{itemize}
+  \item Mindig típusold a bemenetet, és lehetőség szerint a visszatérési értéket is.
+  \item Ettől egyértelműbb lesz a függvény szerződése.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Opcionális és alapértelmezett paraméter}
+\begin{lstlisting}[style=JavaScript]
+function greet(name: string, title?: string): string {
+  return title ? `${title} ${name}` : name;
+}
+
+function power(base: number, exp = 2): number {
+  return base ** exp;
+}
+\end{lstlisting}
+\begin{itemize}
+  \item Opcionális paraméter csak a paraméterlista végén legyen.
+  \item Az alapértelmezett paraméter csökkenti a hívó kód bonyolultságát.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Union típusok}
+\begin{lstlisting}[style=JavaScript]
+let id: string | number;
+id = "A12";
+id = 12;
+
+type Direction = "up" | "down" | "left" | "right";
+let move: Direction = "left";
+\end{lstlisting}
+\begin{itemize}
+  \item A union azt jelenti, hogy az adat többféle típusból érkezhet.
+  \item Literál unionnal szűk, előre ismert értékkészletet adhatsz meg.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Típusszűkítés (narrowing)}
+\begin{lstlisting}[style=JavaScript]
+function printId(value: string | number) {
+  if (typeof value === "string") {
+    console.log(value.toUpperCase());
+  } else {
+    console.log(value.toFixed(0));
+  }
+}
+\end{lstlisting}
+\begin{itemize}
+  \item Narrowing nélkül a fordító nem engedné string- vagy number-specifikus metódusok hívását.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Gondolkodási minta union esetén}
+\begin{itemize}
+  \item 1. lépés: sorold fel, milyen típusok jöhetnek.
+  \item 2. lépés: minden esetre írj megfelelő ellenőrzést.
+  \item 3. lépés: minden ágban csak az adott típushoz illő műveletet végezz.
+\end{itemize}
+\end{frame}
diff --git a/TypeScript_ppt/sections/04_alias_interface_objects.tex b/TypeScript_ppt/sections/04_alias_interface_objects.tex
new file mode 100644
index 0000000..1494f98
--- /dev/null
+++ b/TypeScript_ppt/sections/04_alias_interface_objects.tex
@@ -0,0 +1,61 @@
+\section{Típusaliasok és interfészek}
+
+\begin{frame}[fragile]{Type alias}
+\begin{lstlisting}[style=JavaScript]
+type User = {
+  id: number;
+  name: string;
+  email?: string;
+};
+
+const u: User = { id: 1, name: "Dora" };
+\end{lstlisting}
+\begin{itemize}
+  \item A type kulcsszó jó választás, ha később unionöket vagy utility típusokat is használsz.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Interface}
+\begin{lstlisting}[style=JavaScript]
+interface Product {
+  sku: string;
+  price: number;
+  discount?: number;
+}
+
+const p: Product = { sku: "A-1", price: 100 };
+\end{lstlisting}
+\begin{itemize}
+  \item Az interface különösen hasznos API-szerződéseknél és osztályoknál.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Type vs interface (gyakorlat)}
+\begin{itemize}
+  \item Interface: objektumszerződésekhez.
+  \item Type: unionokhoz, metszetekhez, utility típusokhoz.
+  \item Mindkettő használható objektumokhoz, a csapatdöntés a fontos.
+  \item A legfontosabb: kódbázison belül maradj következetes.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Readonly és opcionálisság}
+\begin{lstlisting}[style=JavaScript]
+type Settings = {
+  readonly appName: string;
+  theme?: "light" | "dark";
+};
+\end{lstlisting}
+\begin{itemize}
+  \item readonly: a property létrehozás után nem módosítható.
+  \item ?: az adott mezőt nem kötelező minden esetben megadni.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Mikor válts type aliasról interface-re?}
+\begin{itemize}
+  \item Ha objektumszerződést publikus API-ként szeretnél kommunikálni.
+  \item Ha osztály implementálja a szerződést.
+  \item Ha a csapatod konvenciója ezt preferálja.
+\end{itemize}
+\end{frame}
diff --git a/TypeScript_ppt/sections/05_generics_and_utility_types.tex b/TypeScript_ppt/sections/05_generics_and_utility_types.tex
new file mode 100644
index 0000000..1db62c6
--- /dev/null
+++ b/TypeScript_ppt/sections/05_generics_and_utility_types.tex
@@ -0,0 +1,65 @@
+\section{Középhaladó: Generikus típusok}
+
+\begin{frame}[fragile]{Generic alap}
+\begin{lstlisting}[style=JavaScript]
+function identity<T>(value: T): T {
+  return value;
+}
+
+const a = identity(42);       // number
+const b = identity("hello"); // string
+\end{lstlisting}
+\begin{itemize}
+  \item A generic lehetővé teszi, hogy ugyanaz a függvény több típusra is működjön.
+  \item A T helyére a fordító a hívás alapján következteti a típust.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Generic constraint}
+\begin{lstlisting}[style=JavaScript]
+function firstItem<T extends any[]>(items: T) {
+  return items[0];
+}
+
+const first = firstItem([10, 20, 30]);
+\end{lstlisting}
+\begin{itemize}
+  \item A constraint (extends) korlátozza, milyen típus adható a generic paraméternek.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Utility tipusok}
+\begin{lstlisting}[style=JavaScript]
+type User = { id: number; name: string; email: string };
+
+type UserPatch = Partial<User>;
+type UserPublic = Pick<User, "id" | "name">;
+type UserWithoutEmail = Omit<User, "email">;
+\end{lstlisting}
+\begin{itemize}
+  \item Utility típusokkal gyorsan előállíthatsz új típusokat manuális másolás nélkül.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Record es Readonly}
+\begin{lstlisting}[style=JavaScript]
+type ScoreByName = Record<string, number>;
+
+type Config = Readonly<{
+  apiUrl: string;
+  retries: number;
+}>;
+\end{lstlisting}
+\begin{itemize}
+  \item Record: kulcs-érték struktúra típusosan.
+  \item Readonly: megakadályozza a véletlen módosításokat.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{A genericek tanulási sorrendje}
+\begin{enumerate}
+  \item Először használj kész generic API-kat (pl. Promise<T>, Array<T>).
+  \item Utána írj egyszerű saját generic függvényt.
+  \item Végül vezesd be a constraintet és utility típusokat.
+\end{enumerate}
+\end{frame}
diff --git a/TypeScript_ppt/sections/06_modules_async_and_api.tex b/TypeScript_ppt/sections/06_modules_async_and_api.tex
new file mode 100644
index 0000000..873f3cc
--- /dev/null
+++ b/TypeScript_ppt/sections/06_modules_async_and_api.tex
@@ -0,0 +1,70 @@
+\section{Középhaladó: Modulok és aszinkron működés}
+
+\begin{frame}[fragile]{Modulok: export/import}
+\begin{lstlisting}[style=JavaScript]
+// math.ts
+export function add(a: number, b: number) {
+  return a + b;
+}
+
+// app.ts
+import { add } from "./math.js";
+console.log(add(2, 3));
+\end{lstlisting}
+\begin{itemize}
+  \item Modulokra bontással átláthatóbb és újrafelhasználhatóbb kódot kapsz.
+  \item NodeNext módban importnál gyakran .js kiterjesztést használsz.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Async/Await tipusokkal}
+\begin{lstlisting}[style=JavaScript]
+type User = { id: number; name: string };
+
+async function fetchUser(id: number): Promise<User> {
+  const res = await fetch(`/api/users/${id}`);
+  if (!res.ok) throw new Error("Request failed");
+  return res.json();
+}
+\end{lstlisting}
+\begin{itemize}
+  \item A Promise<User> egyértelműen jelzi a hívó kódnak a várt eredményt.
+  \item Hibakezelés nélkül API-hívásnál nehezen diagnosztizálható hibák jelennek meg.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Kulso csomagok tipizalasa}
+\begin{lstlisting}[style=NodeJS]
+npm install lodash
+npm install -D @types/lodash
+\end{lstlisting}
+\begin{itemize}
+  \item Sok csomag már tartalmaz beépített típusokat.
+  \item Ha nem, akkor @types csomagot kell telepíteni.
+  \item Típusok nélkül külső csomag használata gyorsan any-hoz vezet.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Axios pelda valasz-tipussal}
+\begin{lstlisting}[style=JavaScript]
+import axios from "axios";
+
+type Todo = { id: number; title: string; done: boolean };
+
+async function getTodo(id: number): Promise<Todo> {
+  const r = await axios.get<Todo>(`/api/todos/${id}`);
+  return r.data;
+}
+\end{lstlisting}
+\begin{itemize}
+  \item A <Todo> generic paraméterrel a válasz struktúrája már a hívás helyén ellenőrizhető.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Gyakorlati minta API-khoz}
+\begin{itemize}
+  \item Definiálj külön típusokat a kérésekhez: Request DTO, Response DTO.
+  \item A hálózati réteget különítsd el service függvényekbe.
+  \item A komponensek csak a már tipizált adatot kapják.
+\end{itemize}
+\end{frame}
diff --git a/TypeScript_ppt/sections/07_validation_and_best_practices.tex b/TypeScript_ppt/sections/07_validation_and_best_practices.tex
new file mode 100644
index 0000000..3582d08
--- /dev/null
+++ b/TypeScript_ppt/sections/07_validation_and_best_practices.tex
@@ -0,0 +1,67 @@
+\section{Validáció}
+
+\begin{frame}[fragile]{any vs unknown}
+\begin{lstlisting}[style=JavaScript]
+let loose: any = 123;
+loose = "bármi"; // nincs ellenőrzés
+
+let safe: unknown = JSON.parse('{"id":1}');
+if (typeof safe === "object" && safe !== null) {
+  // itt már szűkíthető
+}
+\end{lstlisting}
+\begin{itemize}
+  \item Az any kikapcsolja a típusellenőrzést, ezért csak átmeneti esetben használd.
+  \item Az unknown biztonságosabb, mert használat előtt kötelező ellenőrizni.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Futásidejű validáció Type Guarddal}
+\begin{lstlisting}[style=JavaScript]
+function isUser(v: unknown): v is { id: number; name: string } {
+  return (
+    typeof v === "object" &&
+    v !== null &&
+    "id" in v &&
+    "name" in v
+  );
+}
+\end{lstlisting}
+\begin{itemize}
+  \item A TypeScript nem helyettesíti a futásidejű validációt.
+  \item Külső adatnál (API, localStorage, URL-paraméter) mindig ellenőrizz.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Strict mód bekapcsolása}
+\begin{lstlisting}[style=JavaScript]
+{
+  "compilerOptions": {
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "exactOptionalPropertyTypes": true
+  }
+}
+\end{lstlisting}
+\begin{itemize}
+  \item Ezek a beállítások kezdetben több hibát mutatnak, de hosszabb távon stabilabb kódot adnak.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Gyakori hibák}
+\begin{itemize}
+  \item Túl sok any használata.
+  \item Null/undefined esetek figyelmen kívül hagyása.
+  \item Túl bonyolult típusok írása stabil alapok nélkül.
+  \item Típusok másolása utility típusok használata helyett.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Bevált gyakorlat röviden}
+\begin{itemize}
+  \item Alapértelmezésben legyen bekapcsolva a strict mód.
+  \item Külső adatot mindig validálj.
+  \item Bonyolult típus helyett használj több kicsi, beszédes típust.
+  \item Legyen következetes kódstílus és linterbeállítás.
+\end{itemize}
+\end{frame}
diff --git a/TypeScript_ppt/sections/08_learning_path_and_practice.tex b/TypeScript_ppt/sections/08_learning_path_and_practice.tex
new file mode 100644
index 0000000..bd31658
--- /dev/null
+++ b/TypeScript_ppt/sections/08_learning_path_and_practice.tex
@@ -0,0 +1,53 @@
+\section{Tanulási Segédlet}
+
+\begin{frame}[fragile]{4 hetes tanulási terv}
+\begin{enumerate}
+  \item 1. hét: típusok, tömbök, objektumok, függvények.
+  \item 2. hét: unionök, narrowing, aliasok, interfészek.
+  \item 3. hét: generics, utility típusok, modulok.
+  \item 4. hét: aszinkron kód, API-típusok, futásidejű validáció.
+\end{enumerate}
+\begin{itemize}
+  \item Napi 45-60 perc folyamatos gyakorlás már jól látható fejlődést ad.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Projektötletek kezdőknek}
+\begin{itemize}
+  \item Teendőlista-alkalmazás (CRUD) típusosan.
+  \item Egyszerű REST API-kliens.
+  \item Jegyzetelő CLI fájlba mentéssel.
+\end{itemize}
+\begin{itemize}
+  \item Cél: az alaptípusok és a függvényszerződések rutinszerű használata.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Projektötletek középhaladóknak}
+\begin{itemize}
+  \item Modulokra bontott mini backend.
+  \item Validációs réteggel rendelkező API-kliens.
+  \item Kis NPM-csomag saját típusdefiníciókkal.
+\end{itemize}
+\begin{itemize}
+  \item Cél: valós, projekt-szerű struktúrában gondolkodni.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Mit erdemes mindenkepp megtanulni?}
+\begin{itemize}
+  \item A típusinferencia értése.
+  \item A union + narrowing magabiztos használata.
+  \item A generics és utility típusok alapjai.
+  \item Futásidejű validáció külső adat esetén.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Önellenőrző kérdések minden modul után}
+\begin{itemize}
+  \item Meg tudom magyarázni, mit vár és mit ad vissza a függvényem?
+  \item Használtam-e any-t ott, ahol az unknown biztonságosabb lenne?
+  \item Tudok-e példát mondani a union + narrowing együtt használatára?
+  \item Validáltam-e a külső adatot, mielőtt használtam?
+\end{itemize}
+\end{frame}
\ No newline at end of file
diff --git a/TypeScript_ppt/sections/09_advanced_types.tex b/TypeScript_ppt/sections/09_advanced_types.tex
new file mode 100644
index 0000000..07b06e9
--- /dev/null
+++ b/TypeScript_ppt/sections/09_advanced_types.tex
@@ -0,0 +1,57 @@
+\section{Haladó Típuskezelés}
+
+\begin{frame}[fragile]{keyof és indexed access}
+\begin{lstlisting}[style=JavaScript]
+type User = {
+  id: number;
+  name: string;
+  active: boolean;
+};
+
+type UserKey = keyof User;   // "id" | "name" | "active"
+type NameType = User["name"]; // string
+\end{lstlisting}
+\begin{itemize}
+  \item A keyof segítségével dinamikusan hivatkozhatsz egy típus kulcsaira.
+  \item Az indexed access típus pontosan kiolvassa egy mező típusát.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Mapped type alapminta}
+\begin{lstlisting}[style=JavaScript]
+type Optional<T> = {
+  [K in keyof T]?: T[K];
+};
+
+type ReadOnly<T> = {
+  readonly [K in keyof T]: T[K];
+};
+\end{lstlisting}
+\begin{itemize}
+  \item Mapped type-pal meglévő típusból generálhatsz új, következetes szerkezetet.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Conditional type és infer}
+\begin{lstlisting}[style=JavaScript]
+type ElementType<T> = T extends (infer U)[] ? U : T;
+
+type A = ElementType<string[]>; // string
+type B = ElementType<number>;   // number
+\end{lstlisting}
+\begin{itemize}
+  \item A conditional type típus-szintű "if" logikát ad.
+  \item Az infer kulcsszóval résztípusokat tudsz kinyerni.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Mikor használd ezeket?}
+\begin{itemize}
+  \item Ha sok hasonló DTO típust kell karbantartanod.
+  \item Ha könyvtárszintű, újrafelhasználható típus-API-t építesz.
+  \item Ha ismétlődő kézi típusmásolást látsz a projektben.
+\end{itemize}
+\begin{alertblock}{Szabály}
+Haladó típust csak akkor vezess be, ha egyszerűbbé teszi a használatot.
+\end{alertblock}
+\end{frame}
diff --git a/TypeScript_ppt/sections/10_oop_and_architecture.tex b/TypeScript_ppt/sections/10_oop_and_architecture.tex
new file mode 100644
index 0000000..6c8e550
--- /dev/null
+++ b/TypeScript_ppt/sections/10_oop_and_architecture.tex
@@ -0,0 +1,60 @@
+\section{Osztályok és Architekturális Minták}
+
+\begin{frame}[fragile]{Osztályok TypeScriptben}
+\begin{lstlisting}[style=JavaScript]
+class Account {
+  constructor(
+    public owner: string,
+    private balance: number
+  ) {}
+
+  deposit(amount: number): void {
+    this.balance += amount;
+  }
+
+  getBalance(): number {
+    return this.balance;
+  }
+}
+\end{lstlisting}
+\end{frame}
+
+\begin{frame}[fragile]{Interface + osztály együtt}
+\begin{lstlisting}[style=JavaScript]
+interface Logger {
+  log(message: string): void;
+}
+
+class ConsoleLogger implements Logger {
+  log(message: string): void {
+    console.log(message);
+  }
+}
+\end{lstlisting}
+\begin{itemize}
+  \item Az interface szerződés, az osztály ennek konkrét megvalósítása.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Rétegezett felépítés röviden}
+\begin{itemize}
+  \item domain: üzleti logika és modellek
+  \item service: alkalmazási műveletek
+  \item infrastructure: API, adatbázis, külső kapcsolatok
+  \item ui/controller: bemenet-kimenet kezelése
+\end{itemize}
+\begin{block}{Előny}
+A jól rétegzett struktúra könnyebben tesztelhető és bővíthető.
+\end{block}
+\end{frame}
+
+\begin{frame}[fragile]{Gyakori tervezési hiba}
+\begin{itemize}
+  \item Minden logika egyetlen fájlban van.
+  \item Az API-hívás közvetlenül a komponensben történik típusos határ nélkül.
+  \item A validáció és üzleti szabályok keverednek.
+\end{itemize}
+\begin{itemize}
+  \item Megoldás: rétegek szétválasztása és tiszta típushatárok.
+\end{itemize}
+\end{frame}
diff --git a/TypeScript_ppt/sections/11_debugging_and_error_reading.tex b/TypeScript_ppt/sections/11_debugging_and_error_reading.tex
new file mode 100644
index 0000000..487c11c
--- /dev/null
+++ b/TypeScript_ppt/sections/11_debugging_and_error_reading.tex
@@ -0,0 +1,42 @@
+\section{Hibakeresés és Fordítói Üzenetek}
+
+\begin{frame}[fragile]{Hogyan olvasd a TypeScript hibákat?}
+\begin{itemize}
+  \item Először a hiba kódját nézd (pl. TS2322).
+  \item Utána nézd meg: "mit kaptam" és "mit vár a típus".
+  \item A hiba gyakran a hívási pontnál jelenik meg, de az ok lehet korábban.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Tipikus hiba: TS2322}
+\begin{lstlisting}[style=JavaScript]
+let count: number;
+count = "10"; // TS2322
+\end{lstlisting}
+\begin{itemize}
+  \item Jelentés: nem kompatibilis típus-hozzárendelés.
+  \item Javítás: konvertálj (Number("10")) vagy javítsd az adatforrást.
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Tipikus hiba: TS2532}
+\begin{lstlisting}[style=JavaScript]
+type User = { name?: string };
+const u: User = {};
+
+console.log(u.name.toUpperCase()); // TS2532
+\end{lstlisting}
+\begin{itemize}
+  \item Jelentés: az érték lehet undefined.
+  \item Javítás: ellenőrzés (if), optional chaining (u.name?.toUpperCase()).
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Gyakorlati hibakeresési rutin}
+\begin{enumerate}
+  \item Szűkítsd a hibát a legkisebb reprodukálható példára.
+  \item Ellenőrizd a bemenet tényleges futásidejű értékét.
+  \item Egyeztesd a runtime adatot a deklarált típussal.
+  \item Írj tesztet, hogy a hiba ne térjen vissza.
+\end{enumerate}
+\end{frame}
diff --git a/TypeScript_ppt/sections/12_practice_workshop.tex b/TypeScript_ppt/sections/12_practice_workshop.tex
new file mode 100644
index 0000000..8f9eb6f
--- /dev/null
+++ b/TypeScript_ppt/sections/12_practice_workshop.tex
@@ -0,0 +1,50 @@
+\section{Gyakorlóműhely}
+
+\begin{frame}[fragile]{Feladat 1: Típusos szűrés}
+\begin{block}{Feladat}
+Készíts függvényt, amely egy vegyes (string | number) tömbből csak a számokat adja vissza.
+\end{block}
+\begin{lstlisting}[style=JavaScript]
+function onlyNumbers(values: Array<string | number>): number[] {
+  return values.filter((v): v is number => typeof v === "number");
+}
+\end{lstlisting}
+\end{frame}
+
+\begin{frame}[fragile]{Feladat 2: Generic API válasz}
+\begin{block}{Feladat}
+Definiálj újrafelhasználható API-válasz típust data, ok és error mezőkkel.
+\end{block}
+\begin{lstlisting}[style=JavaScript]
+type ApiResponse<T> = {
+  data: T;
+  ok: boolean;
+  error?: string;
+};
+\end{lstlisting}
+\end{frame}
+
+\begin{frame}[fragile]{Feladat 3: Runtime validáció}
+\begin{block}{Feladat}
+Írj type guardot, amely ellenőrzi, hogy az adat Todo-e.
+\end{block}
+\begin{lstlisting}[style=JavaScript]
+type Todo = { id: number; title: string; done: boolean };
+
+function isTodo(v: unknown): v is Todo {
+  return (
+    typeof v === "object" && v !== null &&
+    "id" in v && "title" in v && "done" in v
+  );
+}
+\end{lstlisting}
+\end{frame}
+
+\begin{frame}[fragile]{Értékelési szempontok}
+\begin{itemize}
+  \item Típusbiztonság: nincs felesleges any.
+  \item Olvashatóság: beszédes típus- és függvénynév.
+  \item Hibatűrés: külső adat validálása.
+  \item Bővíthetőség: új mező esetén is tiszta marad a kód.
+\end{itemize}
+\end{frame}
diff --git a/TypeScript_ppt/typescript.pdf b/TypeScript_ppt/typescript.pdf
new file mode 100644
index 0000000..489ef17
Binary files /dev/null and b/TypeScript_ppt/typescript.pdf differ
diff --git a/TypeScript_ppt/typescript.tex b/TypeScript_ppt/typescript.tex
new file mode 100644
index 0000000..ef996aa
--- /dev/null
+++ b/TypeScript_ppt/typescript.tex
@@ -0,0 +1,19 @@
+\documentclass[usenames,dvipsnames,aspectratio=169]{beamer}
+\usepackage{./common/webfejl}
+
+% Automatikus frame törés engedélyezése túl hosszú tartalomnál
+\setbeamertemplate{frametitle continuation}[from second][\insertcontinuationcountroman]
+
+\title[Webtechnológia és webalkalmazás-fejlesztés - TypeScript]{Webtechnológia és webalkalmazás-fejlesztés - TypeScript}
+\subtitle{TypeScript}
+
+\begin{document}
+
+\begin{frame}[plain]
+  \titlepage
+  \logoalul
+\end{frame}
+
+\input{typescript_content.tex}
+
+\end{document}
\ No newline at end of file
diff --git a/TypeScript_ppt/typescript_content.tex b/TypeScript_ppt/typescript_content.tex
new file mode 100644
index 0000000..35d2c3c
--- /dev/null
+++ b/TypeScript_ppt/typescript_content.tex
@@ -0,0 +1,15 @@
+% TypeScript tananyag index fajl
+% Ez a fajl csak osszefuzi a szekciokat kezdotol kozepes szintig.
+
+\input{sections/01_intro_and_setup.tex}
+\input{sections/02_basic_types.tex}
+\input{sections/03_functions_and_unions.tex}
+\input{sections/04_alias_interface_objects.tex}
+\input{sections/05_generics_and_utility_types.tex}
+\input{sections/06_modules_async_and_api.tex}
+\input{sections/07_validation_and_best_practices.tex}
+\input{sections/08_learning_path_and_practice.tex}
+\input{sections/09_advanced_types.tex}
+\input{sections/10_oop_and_architecture.tex}
+\input{sections/11_debugging_and_error_reading.tex}
+\input{sections/12_practice_workshop.tex}