Originally this page was pretty huge, but I think it would be better as a relatively short piece.
I’d like to begin by disagreeing with some very common advice.
“Perfect sensitivity” tests aren’t useful and “lower your sensitivity” is lazy advice. High sensitivities are completely viable in a lot of games, and even where they aren’t you can go significantly higher than average with practice.
“Muscle memory” is extremely overrated. If you can truly aim well on one sensitivity, it’ll transfer with basically any change that doesn’t involve changing how you hold your mouse.
Genetics and talent obviously exist, but they are nowhere near as important as correct and consistent practice.
“Reading skill” isn’t really talked about, but along with mouse control it’s a fundamental part of aiming, and it’s just as trainable.
You don’t want to be predicting your target’s movement if it’s possible for them to dodge. React instead, and if you can’t react fast enough then practice your reading.
“Just play and it will come with time” is only true to the extent that you focus on your aiming while you play. This is usually very inefficient compared to isolated and focused aim practice.
Practice outside of the game absolutely can be useful.
Just grinding hours won’t make you good. You need to invest brainpower.