Step 1

1 - Open terminal and give this command ,

npx create-react-app (folder-name) or npx create-react-app .

. means , it doesn't create a folder , import files in a current folder , if we want to create an another folder , in which we can save the files so , use the . command .

2 - Install react-router-dom and react-router-hash-link , react router is basically used for providing the routes for various links.

and saas(for using css )

npm i react-router-dom react-router-hash-link saas;