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+# 1️⃣ What is a REST API?
+
+**REST** stands for **Representational State Transfer**.
+It’s an **architectural style** for designing networked applications.
+
+In REST:
+
+- Everything is treated as a **resource** (e.g., a user, a product, a blog post).
+- Each resource is accessed via a **unique URL**.
+- Standard **HTTP methods** are used to retrieve or modify data.
+
+---
+
+# 2️⃣ REST API Workflow (Diagram)
+
+
+_Figure: A simple REST API communication between Client, Server, and Database._
+
+**How it works:**
+
+1. The **Client** (browser, mobile app, etc.) sends an HTTP request to the **API server**.
+2. The **Server** processes the request and, if needed, communicates with a **Database**.
+3. The **Server** sends back a **JSON response** to the client.
+
+---
+
+## 3️⃣ Key Features of REST
+
+1. **Stateless** – Each request is independent; the server does not store client data between requests.
+
+2. **Client-Server Architecture** – Frontend (client) and backend (server) work independently.
+
+3. **Cacheable** – Responses can be stored (cached) for faster access.
+
+4. **Uniform Interface** – Consistent way to interact with resources.
+
+5. **Layered System** – Multiple layers (like load balancers, cache servers) can exist between client and server.
+
+---
+
+## 4️⃣ HTTP Methods in REST API
+
+| Method | Purpose | Example Endpoint |
+| ---------- | ---------------------------- | ---------------- |
+| **GET** | Retrieve data | `/users` |
+| **POST** | Create a new resource | `/users` |
+| **PUT** | Replace an existing resource | `/users/:id` |
+| **PATCH** | Update part of a resource | `/users/:id` |
+| **DELETE** | Remove a resource | `/users/:id` |
+
+---
+
+## 5️⃣ Setup: Creating a REST API in Node.js
+
+### Step 1: Install Node.js and Express
+
+```bash
+npm init -y
+npm install express
+```
+
+### Step 2: Basic Server Setup
+
+```js
+const express = require("express");
+const app = express();
+const PORT = 3000;
+
+app.use(express.json());
+
+//sample array data
+let users = [
+ { id: 1, name: "Alice", email: "alice@example.com" },
+ { id: 2, name: "Bob", email: "bob@example.com" },
+];
+```
+
+---
+
+## 6️⃣ API Endpoints
+
+### 1. 🟢 GET – Retrieve All Users
+
+```js
+app.get("/users", (req, res) => {
+ res.json({
+ success: true,
+ message: "All users fetched successfully",
+ data: users,
+ });
+});
+```
+
+✅ **Use Case**: View all users.
+
+---
+
+### 2. 🟡 POST – Create New User
+
+```js
+app.post("/users", (req, res) => {
+ const { name, email } = req.body;
+
+ if (!name || !email) {
+ return res.json({
+ success: false,
+ message: "Name and email are required",
+ data: null,
+ });
+ }
+
+ const newUser = {
+ id: Math.floor(Math.random() * 1000000),
+ name,
+ email,
+ };
+
+ users.push(newUser);
+
+ res.json({
+ success: true,
+ message: "User created successfully",
+ data: newUser,
+ });
+});
+```
+
+✅ **Use Case**: Register a new user.
+
+---
+
+### 3. 🔵 PUT – Replace User by ID
+
+```js
+app.put("/users/:id", (req, res) => {
+ const { id } = req.params;
+ const { name, email } = req.body;
+
+ const index = users.findIndex((u) => u.id == id);
+
+ if (index === -1) {
+ return res.json({
+ success: false,
+ message: "User not found",
+ data: null,
+ });
+ }
+
+ const updatedUser = {
+ id: parseInt(id),
+ name,
+ email,
+ };
+
+ users[index] = updatedUser;
+
+ res.json({
+ success: true,
+ message: "User updated successfully",
+ data: updatedUser,
+ });
+});
+```
+
+✅ **Use Case**: Replace all details of a user.
+
+---
+
+### 4. 🟣 PATCH – Update Part of a User
+
+```js
+app.patch("/users/:id", (req, res) => {
+ const { id } = req.params;
+ const { name, email } = req.body;
+
+ const user = users.find((u) => u.id == id);
+
+ if (!user) {
+ return res.json({
+ success: false,
+ message: `User with id ${id} not found`,
+ data: null,
+ });
+ }
+
+ if (name) user.name = name;
+ if (email) user.email = email;
+
+ res.json({
+ success: true,
+ message: `User with id ${id} updated successfully`,
+ data: user,
+ });
+});
+```
+
+✅ **Use Case**: Update only a user’s email or name.
+
+---
+
+### 5. 🔴 DELETE – Remove a User by ID
+
+```js
+app.delete("/users/:id", (req, res) => {
+ const { id } = req.params;
+
+ const index = users.findIndex((u) => u.id == id);
+
+ if (index === -1) {
+ return res.json({
+ success: false,
+ message: `User with id ${id} not found`,
+ data: null,
+ });
+ }
+
+ users.splice(index, 1);
+
+ res.json({
+ success: true,
+ message: `User with id ${id} deleted successfully`,
+ data: users,
+ });
+});
+```
+
+✅ **Use Case**: Delete a user by ID.
+
+---
+
+## 7️⃣ Starting the Server
+
+```js
+app.listen(PORT, () => {
+ console.log(`Server is running on http://localhost:${PORT}`);
+});
+```
+
+---
+
+## 📌 How the API Works
+
+1. **Client** sends a request (GET, POST, PUT, PATCH, DELETE).
+2. **Server** processes it and interacts with the **database** (or array in this example).
+3. **Server** sends a JSON response back to the client.
+
+---
diff --git a/docs/html/05-basic-tag/05-basic-tag.md b/docs/html/05-basic-tag/05-basic-tag.md
index aa278f74..0a645afc 100644
--- a/docs/html/05-basic-tag/05-basic-tag.md
+++ b/docs/html/05-basic-tag/05-basic-tag.md
@@ -249,21 +249,15 @@ H2O
Tag
-
- Lorem ipsum dolor sit amet consectetur adipisicing elit. Quasi culpa,
- eveniet cum est quis atque possimus rerum officia perferendis quidem
- mollitia ab, nulla animi, praesentium excepturi dolore illo iusto
- suscipit.
-
+ Lorem ipsum dolor sit amet consectetur adipisicing elit. Quasi culpa,
+ eveniet cum est quis atque possimus rerum officia perferendis quidem
+ mollitia ab, nulla animi, praesentium excepturi dolore illo iusto suscipit.
-
- Lorem ipsum dolor sit amet consectetur adipisicing elit. Quasi culpa,
- eveniet cum est quis atque possimus rerum officia perferendis quidem
- mollitia ab, nulla animi, praesentium excepturi dolore illo iusto
- suscipit.
-
+ Lorem ipsum dolor sit amet consectetur adipisicing elit. Quasi culpa,
+ eveniet cum est quis atque possimus rerum officia perferendis quidem
+ mollitia ab, nulla animi, praesentium excepturi dolore illo iusto suscipit.