It came upon me to re-read the emacs tutorial. Last time I read it was probably about 17 years ago. Things might have changed since then.
I picked up two things:
C-/
is undo and is equivalent to C-_
C-h c
gives you brief help on a keyboard shortcut. I was using C-h k
but that opens a new window which can be annoying sometimes.
C-h t
takes you to the tutorial.
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