The base input of emacs is ‘M-x’. From there, any command is accessible. And you have ‘M-:’ for evaluating any bit of elisp code. There’s a few UI concepts to learn (frame, window, buffers, point, mark, region,…), but that would fit in a single sheet of paper.

The keys I enumerated are sufficient to discover and execute all available operations in that style of TUI. You don’t have to type commands or command-specific keyboard shortcuts, like you have to in Emacs. It’s analogous to how in a traditional GUI you can discover and execute everything just using the mouse.

Like in the GUI analogy, you can then choose to remember and use the displayed keyboard shortcuts for frequently used operations, but you don’t have to.

It's possible I might once have given emacs a try, if the way people talk about it did not sound like such baffling moon-language: when I encounter stuff like "so I C-x C-f’d into my init.el, M-x eval-buffer’d, then C-c C-c’d an org-babel block before C-x k’ing the scratch buffer" I just want to back away slowly and leave them to it, whatever it is they're doing. Y'all have fun with your C-r X-wing mork-butterfly porg fluffers, I'm going to edit some code over here, using a text editor, that edits text files.