Balanced Budget

I started to use the Albert app to help manage my money. Set a basic monthly budget. Put aside a certain percentage of each dollar to each of the following-

(first set aside a calculated amount of each dollar to bills, then the rest is what you can spend in the other categories)

1. Bills — rent, utilities, food, car, insurance, student loans
2. savings- whatever is left over. I’m hoping I can save 5% of my income into low risk ETFs…. for retirement.
3. money for fun/entertainment/books — ? hopefully