Where can a person go to get more information on APR and low interest credit cards?

APR or annual percentage rate is a financial term and as such a person can get more information on that in books on financial mathematics or in an encyclopedia - or online in the Wikipedia. The APR of a given credit should be specified in the contract or in the brochure. For a low interest credit card, you have basically two options. First, there are cards with an introductory zero interest period. These are suited for a one-time big purchase, but should rather not be held longer than the introductory period lasts. Other cards offer a low ongoing APR, and should be chosen for a rather constant month-to-month balance.