The best way to avoid paying interest on your credit card is to pay your bills on time. Credit cards all come with an interest free period on purchases. So, if you go on a shopping spree, you won't start paying interest on your debt until about 40 to 60 days after your purchase.

Some credit cards offer interest free introductory periods on purchases as a way to entice new customers. You may get up to one year at 0% interest. But, then of course, after the introduction you will have to start paying interest. So, make sure you check out the standard interest rate too.