Credit reports are generated by the three major credit bureaus, Equifax, Experian, and TransUnion, and include details of amounts owed to companies, payment history for accounts including utilities and medical bills, and credit history length. A FICO credit score ranges from 760 for excellent credit to 620 for poor credit, with payment history making up 35% of the score, amounts owed 30%, credit history length 15%, new credit 10%, and credit types 10%. Individuals can improve their FICO score by paying bills on time, avoiding opening multiple new accounts unless needed, keeping balances low at less than 25% of the credit limit, and reviewing their credit report yearly.