Those who have magic words, gestures, sigils, runes, symbols, or circles in their magic system; What's your explanation for it/them?
Personally, I was always irritated with spells and magic that required a specific style of wording, pronunciation, symbols, gestures, or circles to cast the magic. Some sources kinda explain it, but most don't.
Why does it specifically need to be said as leviOsa, instead of leviosA? Why do the fingers need to touch at the exact same point? Why do they need to interlock the knuckles for this very specific ability? Etc.
Do you have a reason for your system that requires such actions? Please share if you do or rough draft an in-world explanation if you can.