Simply going through the lessons this website gives you will drastically improve your performance. It starts out pretty much teaching you how to play the game, but eventually it gets to interesting tactics you'll need to know if you want to get good.
Moreover, you have to have at least some life skills. Being able to think ahead, improvise quickly and work well under pressure, as well as not get frustrated when facing roadblocks (because you WILL run into them), are just a few very useful skills required for this game.
I'm trying to majorly improve at chess. What are some moves or games or anything I can study to get better?