In this Jan. 31, 2018, photo, an assortment of credit cards and rewards cards are shown in Zelienople, Pa. Using the right credit cards for your purchases can help you save money and maximize your benefits. But there are many times a credit card can be the wrong fit for a specific purchase or goal. Here are eight mistakes not to make when it comes to using credit cards. (AP Photo/Keith Srakocic, File)