I’ve been using vim for years, but after a traumatic brain injury my muscle memory for typing got a bit scrambled at the same time my need for something that was
always installed everywhere dwindled. I’d kind of like to finally see what the deal is with emacs, but as holding down multiple keys simultaneously is now more than a bit hard (and so is memorizing all the chords) I’m looking for a game or typing tutor or similar sort of experience that can help me pick up emacs gradually and help me build a new muscle memory without having to actually work on anything important.
Over the years I’ve seen a bunch of games aimed at getting used to vim-style navigation, but not come across anything emacs-centric.
Alternatively I suppose I could just got evil, but as I’ve not used emacs practically I’m a bit confused how you don’t end up with a hybrid of home row touch typing plus having to wander about for whatever chords remain, which seems more like the worst of both worlds rather than the best.
As others say, begin with the built in tutorial. It should be as simple opening Emacs and pressing enter. If for some reason it's not that simple, open Emacs and press Control+h followed by 't'. The tutorial walks you through the basics. The tutorial mentions C-h v. There is also C-h f for functions.
Next, when you're ready, learn Emacs Lisp. You can read An Introduction to Emacs Lisp online or within Emacs (using C-h i eintr).
Otherwise, hack and extend it. The joy of Emacs is that it presents you with programming problems at the threshold of your understanding. You decide whether to dip in. It provides you amazing resources to do it.
I hope you find a speedy recovery to your injury and have fun with Emacs.