Most people have credit cards, when you use your credit card, you should know some common sense. 1, your credit card's credit limit and encashment limits. 2, the monthly billing date, repayment date, the final repayment date of the algorithm. 3, using the mailbox when the monthly bill sent to you, or email, or sent directly to your phone 4, your credit card interest free days. Encashment and overdraft credit cards to pay attention to the issue. 1, if there is no ability to repay, do not overdraw