WHAT IS REACTJS?

React is a JavaScript library for building fast interactive user interfaces

WHY LEARN REACTJS?

• React is the most popular java script library
• There’s a ton of learning resources for ReactJS. 
• You can easily integrate React components into legacy code. 
• Components can be reused and can be nested for easy application composition. 
• The Virtual DOM is extremely efficient at rendering web applications
• It allows complex UIs to be composed from small and isolated 
  pieces of code called “components.”

NOW LETS CREATE A SIMPLE REACTJS!

Note: I suppose you’ve already set up a NodeJS environment.
Let’s install or update the latest version of npm first.

STEP : 1

First, we’re going to install a tool, Create React App, that will allow us to create our first React project, Open up your working directory in terminal and use the commands as follows:

>>mkdir titan_React_demo
>>npm i -g create-react-app ( create-react-app node package sets up the React project )

STEP : 2

Create your project

Navigate to the root directory of your project and create a new React 
project:

>>npx create-react-app first-react-app

STEP: 3

Awesome, you can start your project now

>>cd titan_React_demo 
>>npm start

Your default browser should launch automatically, and you should get a screen like this: