Banks and credit unions are safe places to keep money, with balances insured up to $100,000. Banks earn money through loans and services, while credit unions are non-profit and member-owned. Savings accounts earn interest, usually 1-2% annually, and compound interest is more profitable than simple interest. Certificates of deposit offer higher rates for keeping money on deposit for a set term. Checking accounts allow deposits, withdrawals, and bill payments via checks or debit cards. Overdraft protection prevents fees for insufficient funds but charges its own fees. Proper check writing and endorsement prevents fraud.