Where to learn how to solve mixture questions?

Hi everyone!

Question: Is there a place, website, youtube channel, whatever, that has ALL of the information required to learn to solve mixture questions?

I am asking because every time I try to learn them, I think "this Q will never come up on the GMAT anyways, I'm not gotta google stuff for a week to learn to solve something I most likely will never see"

So for the lazy people like me, can you tell me a page that just has all of the necessary information?