1Introduction to React

What is React

React is a JavaScript library for building user interfaces. It helps developers build fast and interactive web apps using reusable pieces called components. React was created by Facebook and is used by companies like Netflix, Airbnb, and Shopify.

Why we're using React in this course

We'll build real projects in this course, so we need something flexible and reliable. React makes it easy to manage UI and state without getting lost as apps grow. It's also in high demand in real jobs and interviews.

• Reusable components for cleaner code
• Fast rendering using Virtual DOM
• Easy state management
• Huge community and ecosystem

React in a project

We'll use React to build a complete project step by step. Each lesson takes us closer to a working application, starting simple and increasing functionality as we go.

First React component

Here's a simple React component. Don't worry if it's new to you—everything will make sense soon.

function Welcome() {
  return <h1>Hello React</h1>
}

export default Welcome

Before we continue

To follow along, you should know basic JavaScript like functions, arrays, and arrow functions. If you're rusty, don't stress—you'll pick things up as we go.

Mini Project Step

In your project folder, create a new React component called Header. It should return an h1 that says React Course Project. We'll build on this as we go.

React Official Documentation