For me it’s time signatures in music. I grew up playing instruments, played in several orchestras, etc. But no matter how many times someone tries to explain time signatures to me, it makes no sense. I don’t understand why people place such importance on it. To me, notes have a pitch and a duration, maybe some dynamics. That’s it. I don’t understand why people try to needlessly complicate it. It doesn’t give you anything.
My wife will hear a song and go “Oh neat, it’s in 5/8.” And I’m like “How tf do you know that, and why does it matter?”
Try trackers, in particular Renoise (it’s free to use as a demo, without exporting, though there are workarounds for that). At the first glance, it’s a spreadsheet where you place samples playing notes. In practice, it works great for people like me who can barely tell what different notes sound like, much less feel intervals and stuff. You just put your samples such that you get the rhythm you want, and don’t forget to twiddle the effects because they make a big difference. Of course, this works best for dancey electronic music.