<prompt> Human: Hey there! First time poster, long time lurker. I have three credit cards to my name. They are all bank cards as in the bank distributes them, though they are very much credit cards. All three cards are paid in full each and every month thanks to my banks autopay feature. Now, I personally only use one card at a time. The card with the rewards and limit is my primary. The other two are tucked away after a year or so of use each. Ive read many posts that suggest I should use each card regularly one for groceries, one for gas, etc, just to carry a balance. However, I hate carrying around that many cards for fear of loss or theft. Ive also read not to kill them because it could damage my score. A little background: young guy, 25years old. American. No debts. No loans. Any suggestions are greatly appreciated!Thanks! UPDATE: Thanks everyone for your advice and suggestions. The main takeaways I received and Im moving forward with are: -If there is no annual fee, dont close the cards-Use the cards one or two recurring fees i.e. Netflix, cableinternet, etc. -Dont carry a balance on any of the cards, month-to-month.  <response>: Just throw them in a safe, with the rest of your paper and plastic. You dont necessarily need to use them.This is addressed in our faq: 