If you want to internalize the vi cursor keys hjkl a good and fun way to do it is to play "hunt" (part of the "bsdgames" debian package, man page at https://manpages.debian.org/unstable/bsdgames/hunt.6.en.html ).

Hunt is a text based 2d multiplayer labyrinth deathmatch game. It even has a unique feature: Labyrinth walls that you can shoot and that will eventually regrow (sometimes different than before).