<prompt> Human: I just turned 20, a month ago and I finally got approved for my first credit card .Its the discovery It , Ive heard a lot about it.So, I have some questions.1. What things should I buy on it and what shouldnt I ?2. This is stupid , but I got approved for 1500, so what happens when I use up my credit line? Do apply for another or something.To be specific, not Im gonna do this , but if I buy a 1500 dollar computer on the card, pay it off that month, whats next?3.Besides paying in full every month, what credit amendment do you live by?4.Whats account credit line 1500 vs cash advance credit line,800?  <response>: What things should I buy on it and what shouldnt I ?Buy things you can afford and you will pay for when the statement closes. Dont buy things you cant afford or wont pay for when the statement closes. This is stupid , but I got approved for 1500, so what happens when I use up my credit line? Your credit is rotating. So you charge 100 you now have 1400 max left to spend. You pay back that 100 your credit limit is back to 1500. 1500 is how much debt you can have at one time. If you start charging after youve reached 1500 they may issue you an over limit fee and eventually will decline purchases.I buy a 1500 dollar computer on the card, pay it off that month, whats next?You buy another 1500 computer. You can even buy multiple 1500 computers in a single month as long as you paid off the last computer you can make a payment at any timeBesides paying in full every month, what credit amendment do you live by?Whats a credit amendment? Check your benefits. Discover offers price protection, for example. They are all written on that booklet your card came with. Read it..Whats account credit line 1500 vs cash advance credit line,800?You can charge 1500 with of stuff. You can take 800 cash out of the ATM. Dont ever do that!!! Its insanely expensive and you pay interest from the second you take out the money. Ask for then to lower your cash advance limit to zero. Some cards will and some wont. 