A Great Way to Improve
Many beginners play chess, lose, get all mad and play again, without finding out why they lost. It's impossible to lose without making a mistake, so a great way to improve is to analyze your games afterwords and see where you made a mistake.
By analyzing a game, you play over it and find your mistakes, blunders, good moves, and great moves. You find what you missed and what your opponent missed. You should try to learn at least one thing from each game you play. Then in your next game, you won't make the old mistakes you used to make, and your play will get better and better.