This post is Apple Mac specific so Linux and Windows users can have the day off.
I came across this tweet that has a very useful piece of parenthetical information:
TIL about `winner-mode` for #emacs. Excellent tool (especially after having gotten used to Cmd-Ret on iTerm2).
— tzj (@thetimmyjose) May 23, 2019
I’m a heavy user of winner-mode so that part of the tweet wasn’t news to me. What was news is that ⌘ Cmd+Return toggles full screen mode in iTerm2. I don’t often use a non-Emacs shell but when I do I use iTerm2 and sometimes find it useful to have it in full screen mode but making it full screen in the normal macOS way (clicking buttons) was just enough friction that I often didn’t bother. This method is fast and easy and doesn’t involve the mouse at all.