I've been a vi user for 25 or so years, and I really only know a few commands - how to search/replace, repeat last operation, search for the thing under the cur

I've been a vi user for 25 or so years, and I really only know a few commands - how to search/replace, repeat last operation, search for the thing under the cursor, yank/paste, #[cmd], block mode, set mouse=a, and so on. In that capacity I have supported myself as a software developer, productively, with much satisfaction in my selection of editing tool. So I'm often quite delighted at learning new things with it, even still! And to be frank, I think this is one of the things I most like about vim - even though I've been using it for years, there are still undiscovered treats yet to be revealed to me, over and over. When I discovered cscope integration, some 10 years ago, it was like getting an OS upgrade .. in my editor! :)