Hm, is there like... a beginner-friendly guide to mailing changes via git?

Hm, is there like... a beginner-friendly guide to mailing changes via git? (Or at least a friendly being who can teach this to a friendly fluffy dragon?)

I'd love to learn how this works so I could allow others to add contributions to my projects while Forgejo isn't ready with federated pull requests yet. ^^'

#git