Install npm and then run following commands on terminal to start with react.
npm install -g create-react-app
It will take you to browser on URL localhost:3000.
First call is in src/index.js.
A component takes in parameters, called
props, and returns a hierarchy of views to display via the
render method returns a description of what you want to render, and then React takes that description and renders it to the screen. In particular,
render returns a React element, which is a lightweight description of what to render.