This is a great intro! I've been using Emacs since 1996 or so and I still learned a new key: M-m, which will go in my lexicon immediately.
BTW, "M-g g" (goto-line) is also bound to "M-g M-g" which I find much easier to type.
Another thing I discovered way too late about Emacs was the "q" key. When you're in a read-only buffer like a diff, a man page, an Emacs help page, or an info page, pressing "q" will bury the buffer and close the window (if it wasn't open before the buffer appeared). I find this tremendously useful.
BTW, "M-g g" (goto-line) is also bound to "M-g M-g" which I find much easier to type.
Another thing I discovered way too late about Emacs was the "q" key. When you're in a read-only buffer like a diff, a man page, an Emacs help page, or an info page, pressing "q" will bury the buffer and close the window (if it wasn't open before the buffer appeared). I find this tremendously useful.