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Re:Emacs: The Editor for the Next Forty Years [video] by Rediscover on Tuesday November 26, 2019 @09:59PM (#21644894)
I love view-lossage. How often do You use C-x <esc> <esc> which shows elisp for what ya just did? Eg, switch buffer then try it.
Re:Emacs: The Editor for the Next Forty Years [video] by TeMPOraL on Wednesday November 27, 2019 @02:02AM (#21645892)
Oh, I didn't even know about that! That's great!

Also, it reads straight from command-history variable (another thing I didn't know about). You can preview and browse it via C-h v command-history. Or, write your own elisp operating on it (perhaps interactively, by IELM - the elisp REPL).