how to add bootstrap link in react js code example

Example 1: add bootstrap to react

1.run commnad in cmd
npm install bootstrap --save

2.after install add this to index.js
import 'bootstrap/dist/css/bootstrap.min.css';

Example 2: react bootstrap do you need to import

1.run command in cmd
npm install react-bootstrap bootstrap

2.after install add this to index.js
import 'bootstrap/dist/css/bootstrap.min.css';

//You may want to add individual components like 'Navbar',
 // or 'Button' rather than the entire library.
3. add this, or similar to the js files that would be using the individual components
import {Navbar, Nav, Button} from 'react-bootstrap';

Example 3: bootstrap import in react

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css"
   integrity="sha384-9gVQ4dYFwwWSjIDZnLEWnxCjeSWFphJiwGPXr1jddIhOegiu1FwO5qRGvFXOdJZ4" crossorigin="anonymous">