Coming from using Xcode 13 to 15, I'm missing the new concepts on how to commit and push code changes to GitHub in 15. I tried using the menu Commit... (like I did before), wrote a message, and pushed the changes to my repository. Now when I try that, a new window appears with things about, staging, append, etc, and I'm not sure what all that means.
Is there (and where is it) documentation on this new source control paradigm? All I find is docs for the "old way".