The tips for maintaining credit cards are as follows:

1. Apply for several credit cards and try to use different functions of each credit card. However, you need to pay attention to the credit card repayment time to avoid being on the credit blacklist.

2. Swipe your card as much as possible. A general credit card can be exempted from annual fees as long as it is swiped six times. In addition, frequent swiping can increase the credit limit.

3. Protect the security of credit card information, swipe cards safely, and beware of card duplication.

4. Try not to use credit cards to withdraw cash. The handling fees and interest for cash withdrawals by credit card are very high. Unless it is an emergency, do not use credit card to withdraw cash.

5. When using a credit card, if you encounter problems, you must communicate with customer service in a timely manner.