---
title: Learn React.js in 5 minutes
tags: [React, JavaScript, Web Development]
style: border
color: primary
description: A quick introduction to the popular JavaScript library.
---
Source: [freecodecamp](https://medium.freecodecamp.org/learn-react-js-in-5-minutes-526472d292f4)
This tutorial will give you a basic understanding of React.js by building a very simple application. I’ll leave out everything which I don’t think is core.
## The setup
When getting started with React, you should use the simplest setup possible: an HTML file which imports the `React` and the `ReactDOM` libraries using script tags, like this:
```html
```
We’ve also imported Babel, as React uses something called JSX to write markup. We’ll need to transform this JSX into plain JavaScript, so that the browser can understand it.
There are more two things I want you to notice:
1. The `` with the id of `#root`. This is the entry point for our app. This is where our entire app will live.
1. The `