🖥️ Backend Dev Journey — C# & .NET

A repository documenting my journey learning backend development with C# and .NET — from zero to building real-world APIs.

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📖 What is this?

This repo is my personal learning log as I go through backend development concepts step by step.
Each lesson covers a core backend concept with real code, explanations, and mini projects.

🗺️ Learning Roadmap

#	Topic	Status
1	How the backend works	✅ Done
2	HTTP & REST API	✅ Done
3	API Architecture & Controllers	✅ Done
4	Middleware	🔄 In progress
5	Routing	⏳ Coming soon
6	Database	⏳ Coming soon
7	ORM (Entity Framework)	⏳ Coming soon
8	Authentication (JWT)	⏳ Coming soon
9	Security	⏳ Coming soon
10	Backend Architecture	⏳ Coming soon
11	Testing	⏳ Coming soon
12	Performance & Scalability	⏳ Coming soon

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🧠 Core Concepts (Quick Explanation)

What is a Backend?

The backend is the brain of an application. It handles:

• Receiving HTTP requests from the client
• Applying business logic (rules, calculations, permissions)
• Reading & writing data from a database
• Sending back a structured response (JSON)

[Browser / Mobile App]
        ↓  HTTP Request
    [Backend .NET]
        ↓  SQL Query
   [Database]
        ↑  Data
    [Backend .NET]
        ↑  JSON Response
[Browser / Mobile App]

What is a REST API?

A REST API is a set of conventions for building clean, predictable APIs using HTTP methods as actions:

Method	Action	Example
GET	Read data	GET /api/products
POST	Create data	POST /api/products
PUT	Update data	PUT /api/products/1
DELETE	Delete data	DELETE /api/products/1

Project Architecture

📁 Lesson_1
📁 Lesson_2
📁 Lesson_3
│   ├── 📁 Controllers
│   ├── 📁 Services
│   ├── 📁 Models
│   └── Program.cs

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⚡ Running the Project

Prerequisites

• .NET 8 SDK
• Postman (to test the API)
• A code editor — VS Code recommended

1. Clone the repository

git clone https://github.com/your-username/your-repo-name.git
cd your-repo-name

2. Navigate to a lesson project

cd Lesson-03-Controllers/ApiProduits

3. Run the project

dotnet run

You should see:

Now listening on: http://localhost:5041

4. Test the API with Postman

Method	URL	Description
GET	http://localhost:5041/api/produits	Get all products
GET	http://localhost:5041/api/produits/1	Get product by ID
POST	http://localhost:5041/api/produits	Create a new product
DELETE	http://localhost:5041/api/produits/1	Delete a product

POST request body example:

{
  "nom": "Keyboard",
  "prix": 59.99,
  "categorie": "Informatique"
}

5. Expected HTTP status codes

Code	Meaning
200 OK	Request successful
201 Created	Resource created successfully
404 Not Found	Resource not found
400 Bad Request	Invalid data sent
500 Internal Server Error	Server-side error

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🛠️ Tech Stack

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📝 License

This project is open source and available under the MIT License.