How Does React Work?
The core idea behind React is that, unlike traditional websites where everything is bundled into a single page that reloads completely when you click a link, React splits the webpage into small, reusable pieces called components.

A component is a small piece of code that has its own logic and can be reused across the application. For example, a button, a navigation bar, or even a form can each be components.

Frameworks that divide your page into smaller parts and update only the necessary sections are called Single Page Application (SPA) frameworks. React is one such framework.

There are other frameworks that follow the same idea of updating only the parts of the page that have changed. For example, Vue.js is another SPA framework, but it has a different approach than React.

Now, let’s dive into how React achieves this efficient page update process:

Virtual DOM (VDOM):
1- React creates a Virtual DOM—a lightweight copy of the actual DOM. When a change happens (like a user clicks a button or submits a form), React doesn't immediately update the real DOM. Instead, it creates a new virtual DOM that reflects the changes.

2- Comparison:
React then compares the new virtual DOM with the previous version of the virtual DOM, looking for differences.

3- Efficient Update:
React calculates the minimal set of changes required to update the real DOM, which means it only re-renders the components that have changed. This is much faster and more efficient than reloading the entire page.

What is JSX?
React uses JSX, which stands for JavaScript XML. It’s a syntax extension that allows you to write HTML-like code inside JavaScript. JSX is a combination of both JavaScript and HTML.

How to Set Up React:
Before you can start working with React, you need to set it up on your machine. Here’s how you can do that:

1- Install Node.js and npm: React requires Node.js, (a runtime environment for JavaScript that allows you to run JavaScript code outside the browser), and npm (Node Package Manager), which helps you install and manage libraries for your project.

2- open your terminal and run the following command to create a new React app:

npx create-react-app my-app

npx: This is a package runner tool that comes with npm, allowing you to run code from packages without needing to install them globally.

create-react-app: This is a command-line tool that automatically sets up a new React project for you.

my-app: This is the name of your app (you can choose whatever name you like).

3- Navigate to Your App Folder: Once the setup is complete, navigate into the app directory by running:

cd my-app

4- Start the Development Server: Now, you’re ready to see your app in action. Run the following command:

npm start