YNAB was often recommended, although I cannot personally understand "budgeting" as a concept and how YNAB helps you achieve your financial goal.

(When I was a graduate student with $20k income, I spent a lot of time thinking about how to save money. Then, one day, all of a sudden, I realized that I should use that time thinking about how to earn more money instead. These days, I earn more than 10x that number, and the only rule I try to abide by is do not buy things I don't need, as I already have a good spending habit. I never felt as financially constraint as when I living on ~$2000/month.)