[gpvos]

In git(1) it's below LOW-LEVEL COMMANDS (PLUMBING). You cannot expect a novice to read thoroughly past something like that.

And it's remarkably hard to find using web searches, since most git documentation uses the term "commit" for these things, not "revision".[0] I found it after I discovered "git help -g", which lists "some concept guides" according to "git help".

Of course, n=1 and stuff, but there's a lot about git that is not obviously documented. Something like this should be linked to in multiple places, so even if you skim over one you'll catch it relatively early.

[0] The name of the man page was chosen to avoid conflict with the "git commit" command, I guess?