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?”
I have a friend who’s a skater and when he doing a kickflip I asked how it worked, as in, how do you make sure the board doesn’t land upside-down or whatever and he was like, “You just launch off and then deal with it.” which was not at all helpful lol. There must be some sort of logic to it!