From ~ 4 minutes here is good but general flow is not to work on `main` branch on your forked repo, but to create a new branch per PR.

https://youtu.be/P9pc8hk9ra0?si=PvAUBwO0DMJqeS-J&t=240

https://gist.github.com/blackfalcon/8428401

If you're not familiar with the cli, the github client is apparently pretty good.

Larger open source projects will have a CONTRIBUTING guide that may detail project specific guidelines. e.g. https://github.com/bitcoin/bitcoin/blob/master/CONTRIBUTING.md or https://docs.btcpayserver.org/Contribute/