The presenter talk about teachingopensource.org, and how they have put together educational materials for Free and Open Source software. He says that the material is put together my teachers. see teachingopensource.org git search
I got this link from reddit https://learngitbranching.js.org/ maybe it will be of use. But I doubt that it will make git easy to use.
Note: I have not tried itthese yet.