Create new project in reactcreate-react-app project-name.

Step 1:start projectnpm start using this command into terminal.

Now you can install your bootstrap usingnpm i --save react-bootstrap. After you're done you should install bootstrapnpm i --save bootstrap as well.

Okey then after you're done with installing bothreact bootstrap andbootstrap.

You can go to your react folder. Undersrc > index.js. That is your entry point for your web app.

From there you should import bootstrap through this line here

import Bootstrap from `bootstrap/dist/css/bootstrap.css

You can save that.

Now you can go to yourapp.js file. It's undersrc as well.

You can import anything bootstrap as an example. I'll just button because it's simple.

import { Button } from 'react-bootstrap'

App.js file

return(  <Button bsStyle='success'> Hello </Button>)

Reference -React Bootstrap