<prompt> Human: So, i hear that a credit card is a good thing to open about right now. I just have a few questions, well really just one. In order to open a credit card with my bank, the minimum i am able to start is 300. Now if i spend less than that 300 i.e. i spend 50, then i only pay back the 50 before its past due, correct? I know its a dumb question, but id rather know that answer before i start. Thanks!  <response>: Youll probably get plenty of good advice in this forum, but my 0.02:Dont underestimate the importance of making every payment on-time. I learned the hard way at your age that even just a couple missed payments can have serious, long-term effects on your credit. 