Modes, motions, edits, search and replace, registers, splits, macros. The 100 commands you actually use.
:w, :q)D)diw = delete word)ci" = change inside quotes){operator}{count}{motion}. d2w = delete 2 words. y3j = yank 3 lines down. c$ = change to end of line. Once this clicks, every other Vim trick gets cheap.:ls to see numbers)