<prompt> Human: Hey PF! First time poster but long time troller. A little background about me:Im 19, started building my credit a little less than a year ago, and I just got approved for my fourth credit card between all of my cards, including my store card to JCPenney, I now have 5300 in credit. I know the higher your credit line and more accounts you have open, the better your score is. I know not to go overboard on how many cards I get, and I use the cards responsibly.Now my question: I heard that its better for your score to leave a little on your card and not pay your balance off in full every month. Is this true? Should I just use my new card once and then let it sit?Thanks for replies and help in advance!  <response>: Pay your statement balances in full every month. Paying interest for no reason is not going to get you a higher score, that is a complete falsehood. 