how do you get better in games

How I play a game in a competitive manner (example League): I try to know my enemies, their abilities, their ups and downs and how good the player is. I try to find out every little thing about the champion I am playing, how my team plays and then I adapt myself to the situation. People are usually static when it comes to this, they always want to do their strategy, but if you are good you can adapt to your team. Teamwork > solo play.