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 had a similar experience until I read more books, specifically older books. Turns out when people had only written letters and books as the main media of communication, they wrote elegant prose. Who knew? lol
Also when struggling to find words to fill my paragraphs, I reached for connectives, and synonyms in a thesaurus. Without these, my paragraphs looked like a random assortment of sentences, repeating themselves to oblivion.