Comment by bandrami

Even though I'm more of an Emacs user, I'd say if you're going to learn one, learn vi. Not vim, mind you: nvi, the original one (you can emulate it in vim with "set compatible"). Use it for a few months until you get muscle memory for it. Just about any UNIX-like system you'll work on, anywhere, has at least the old vi, and it's very useful to just have that muscle memory tucked away.