Keeping detailed records of all financial transactions, whether through a spreadsheet, notebook, or online calculator, is important to avoid issues. Writing checks helps prevent others from misusing money and reduces the need to carry large amounts of cash. It is also important to save money for large purchases or emergencies by putting funds in a savings account that earns interest but does not allow writing checks. Debit cards provide another option for accessing funds without writing checks but typically charge per-use fees, so withdrawing larger sums less often can help save money on fees.