That conversation already went off the tracks at "internally", since it shouldn't matter at all how it works internally. We do not learn how most things work in detail, because we wouldn't have time to live our life if we did.

In this particular case, git is a version control tool and it supports various typical operations for such tools. One should be able to learn the commands and then successfully use the tool. If that's not possible, I continue to assert that there's a problem with the tool.