Follow the instructions on Github to Create an Access Token in Github
By default, git credentials are not cached so you need to tell Git if you want to avoid having to provide them each time Github requires you to authenticate. On Mac, Git comes with an “osxkeychain” mode, which caches credentials in the secure keychain that’s attached to your system account.
You can tell Git you want to store credentials in the osxkeychain by running the following:-