i cannot recommend the channel "8-bit music theory" hard enough. here's the video that made percussion make sense to me, for a taste: https://youtu.be/FoMmVlAvjmM?si=ShW-KxlquOnq4-F6
not only does the video game framing make it more palatable than a big theory textbook, but the guy also just has such a fun way of talking about music, and it's clear he really knows what he's talking about.
i've been rewatching a lot of his old stuff lately to try and take my composition up a notch or two, so i figured i'd share for anybody interested 