<prompt> Human: I opened a Best Buy credit card to buy a graphics card for my computer when mine suddenly died. I paid it off quickly in about 3 months, and havent used it since. Which would be better for my credit score: continue to make small purchases and pay them off right away, or just leave the card inactive until they eventually close it for me due to inactivity? FWIW, my credit score is 750. I have 4 total lines of credit: student loans 3500 will be paid off by end of summer, Bank of America CC which I pay off monthly, a furniture store credit line 24 months no interest!, and the Best Buy Card.  <response>: Ive got a Best Buy card that Ive had for years, and make a point to use it a couple of times each year. Youve definitely not got enough cards for this one extra one to be a problem. Meanwhile youve got a 0 interest payment option to replace any major appliances that happen to die on you why spend your own money in an emergency, when you can spend someone elses for free?. Id keep it. 