As far as some people go one is too many! Credit Card companies love people to use their cards and they want to make that interest! If they say zero interest BEWARE! If you miss one payment then they really hit you with the interest. Read the fine print ALWAYS! One card should be used and only for emergencies or reserving hotel rooms, airline tickets, tickets to concerts, etc. The bottom line, if you can't afford cash don't use your credit card!