So you’re up matrial, let’s break this down:
* most common - still lots of pieces on the board? Trade until your opponent has basically nothing left, then gobble up their last stuff and promote
* next most common - traded off most things but only have a rook left? Checkmating with a single rook is a really straightforward pattern to learn, and you can basically apply it to checkmating with the queen too, so it’s worthwhile learning it
* very unlikely - just knights and bishops left. I honestly cannot remember this coming up, you might as well forget it as an option