I followed this tutorial https://www.freecodecamp.org/news/how-to-build-a-react-project-with-create-react-app-in-10-steps/
After I was happy with the result I ran :
npm run build
the build/ folder was created and then I pushed it to this repository
to clone from your computer to GitHub repo : https://superuser.com/questions/1412078/bring-a-local-folder-to-remote-git-repo
triggering actions !!!!