How to better my aim at COD?

If it's the PC variant you'll also want a 144hz monitor and high end gear or very low settings to run at the highest FPS possible. This is for the smoothest aim and frames, and also to help with trickier shots. Bump up the digital vibrance if you have to, turn off anti aliasing so the outlines of people are more jagged so they stand out more, Some peole even play on 4:3 just so people seem larger. But that should help a ton.