After a game I like to see both what mistakes I made and what good plays my opponent made to counter my opening.
From there I become more knowledgeable about how to handle certain positions and how to follow through with my attacks.
Stuff like that is probably what you should be doing.
I've been told a lot to analyse your games, but I'm not really sure what to do with them or how I'm supposed to improve off them? Like am i supposed to take a lesson from each game and put it into the next? If someone could help me understand that would be really nice thank you!