I'm still learning more commands, actually. h j k l w b { and } are some good ones to start with, and then once you find yourself using those all the time, you can pull out a vim cheat sheat and learn some more, like e ( ) # and *, and so on...

I have not yet found a language that doesn't have a vim mode, at least in my Gentoo installation. This includes HTML, CSS, Lisp, C, Python, Xorg.conf, various Gentoo system files, httpd.conf, and anything else I've seen.