Teenage girl looking for a good app to track money or any other ways that are good to track money spending

Hi I’m trying to keep stricter track of my expenses. I am looking for the best way to do that? Specifically like an app or I’ve heard of people using excel sheets. I don’t have any bills to pay or anything I am just a 19 year old girl with a job I do make a lot of money for a 19 year old, but I think I spend too much money and want to get into saving more.

For an app I am looking for something that doesn’t require you to put your bank info in there I just want to be able to input numbers and create like “folders” I can visualize how much money I have and want to put towards if that makes any sense? That I can also like subtract from whenever I make purchases? If that makes sense lol

Thank you recommendations appreciated