Those wishing to learn VI…
A useful tutorial comes with the vim package, vimtutor. This is how I learned, when I stuffed SuSE Linux onto a 386 with a 120MB HDD and found I didn't have room for emacs¹.
vim was all I had, so I was forced to confront it instead of running away. I've been a vim user ever since. I'm a bit rusty with OpenBSD, but pkg_add vim will probably do the trick.
¹: Yes, I know, Eight Megs And Constantly Swapping!