The only level of detail you need to track your finances to is subtracting your expenses from your income each month. As long as you spend less than you earn,

The only level of detail you need to track your finances to is subtracting your expenses from your income each month. As long as you spend less than you earn, you don't need to worry more than that. If you'd like be saving more money than you currently are, then you can drill down into each side to look for things to improve.