After you have tracked your spending, put all your expenditures into categories. Rent or mortgage and bills should be in a category together, and other categories can include food, transportation, entertainment, savings, incidentals and school. Personalize your budget categories to your lifestyle. If you have college students, you might have a category for tuition or textbooks. Your budget will not look the same as your parents’ or your friend’s budgets, because you have different spending habits and needs.