In short: turn Emacs navigation into Vim-like navigation, make the editing modal, and thus make navigation hyper-efficient. (If you like the idea, I would suggest taking a look at evil-mode if you come from Vim, or god-mode and devil-mode if you already are used to Emacs.)

A few useful pieces of advice beside that, too. The workflow the author describes is not how I prefer to do things, but the author mentions a number of important capabilities to be aware of: operating at sexp level, subword motion, etc. Narrowing and folding, which I like to use, are not mentioned.

No mention of LSPs or compilers, but these are their own large topic.