<prompt> Human: I have never previously owned a credit card before but think it would be wise to start building a good credit score. I know some tips to do that such as never putting more than 50 of your credit limit on your card and obviously paying some interest. Beyond that what should I look for in a card? Will higher interest rate build credit faster if it is paid off in a timely manner? And are any rewards systems that credit card companies offer really worth a second look?  <response>: You shouldnt pay a cent of interest. Its completely unnecessary and wont built credit any faster. All youll be doing is throwing away money. 