1//1.run following commnad in cmd:
2npm install bootstrap --save
3//you can now use bootstrap component. example:
4import { Button } from 'react-bootstrap';
5
6//2.or  add this to index.js:
7<link
8  rel="stylesheet"
9  href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/css/bootstrap.min.css"
10  integrity="sha384-B0vP5xmATw1+K9KRQjQERJvTumQW0nPEzvF6L/Z6nronJ3oUOFUFpCjEUQouq2+l"
11  crossorigin="anonymous"
12/>

1npm install bootstrap --save // Inside of your command line
2
3import 'bootstrap/dist/css/bootstrap.min.css'; // Inside of your index.js

1npm install react-bootstrap bootstrap

1	npm install bootstrap
2

1	import $ from 'jquery';
2	import Popper from 'popper.js';
3	import 'bootstrap/dist/js/bootstrap.bundle.min';
4