I use Vim 8 (via MacVim) every day, but I'm definitely not at an advanced level!

I'd say the most advanced stuff I do is gqap, and performing substitutions via regex, either with a range or in visual mode.

I'd appreciate suggestions as to the best path to take, to move to a more advanced level of Vim 8. (Note I mention Vim 8 explicitly. Also, if extending my existing vimrc becomes a thing to do, I'd want to do it myself, learning what each not does!)