Any mechanics guide videos?

holy crap, all the videos I try to look up are just stupid build guides and beginner guides on how to play a class… That’s not what i want to watch. i’m just trying to wanting to learn the mechanical game guides on what to explain to me. I don’t wanna jump in the game anymore. Is the community of YouTube video making this dumb?

The mechanics of what? Dungeons (there are guides to the boss mechanics)? The Abby/Uberroth (I’m sure there are guides for those)? The new rift beasts (no idea but there probably are)?