There is no one-size-fits-all answer to how many credit cards you should have. It's a matter of personal preference and financial responsibility. For many individuals, one or two well-managed credit cards are sufficient. However, if you can handle them responsibly and benefit from the rewards and benefits, having a few additional cards may make sense. Always monitor your credit usage and financial situation to make informed decisions about your credit card portfolio.

Interest on a credit card is the cost of borrowing money from the card issuer. It's calculated based on the card's Annual Percentage Rate (APR) and your average daily balance. If you don't pay your full balance by the due date, you'll be charged interest on the remaining amount, and this can accumulate over time if you carry a balance. To avoid interest charges, pay your balance in full each month.

A credit card allows you to borrow money from a bank up to a set limit. You use the card to make purchases, and the bank sends you a bill at the end of each billing cycle. You can either pay the full balance to avoid interest or pay a minimum amount, which incurs interest charges. Responsible credit card use can help build your credit score, and some cards offer rewards for spending.