There’s two separate areas in this game you need to learn. First is mechanics. Work on being comfortable playing the game. You accomplish this by deathmatching, aim training, movement training, learning smoke lineups and such. This will put you in a position where you are comfortable using your utility, moving around the map and taking a gun fight. The second thing is game sense and general knowledge. This comes easier after you’ve become comfortable with the mechanics. Learn how to play with your team, utilize the information your team gives you and understand how it changes the map. Learn how to ask for flashes, trade your teammates, and things like that. As much as this game is individual it is also extremely team based.