directory, a commit represents that state in "time", and explains how
to get there.
-Normally a commit would identify a new "HEAD" state, and while git
+Normally a commit would identify a new "HEAD" state, and while Git
doesn't care where you save the note about that state, in practice we
tend to just write the result to the file that is pointed at by
`.git/HEAD`, so that we can always see what the last committed