Card maintenance is a credit card usage strategy that aims to increase your credit card limit and credit score in order to obtain better credit terms and interest rates when needed. This strategy typically involves using your credit card for purchases on a regular basis and making your payments on time in order to build a good credit history in the eyes of the credit card company.

The following are some suggestions for maintaining a credit card:

1. Use credit cards regularly: Use your credit card at least several times a month for small purchases, such as buying daily necessities, paying bills, etc. This helps show credit card companies that you are an active user and can help increase your credit limit.

2. Repay on time: Repay the credit card in full every month before the due date to avoid interest and late fees. Making on-time payments can help improve your credit score while avoiding additional financial burdens.

3. Keep the debt ratio low: Try to keep the credit card usage limit below 30% of the credit limit. An excessive debt ratio may have a negative impact on your credit score.

4. Avoid frequently applying for new credit cards: Frequently applying for new credit cards may have a negative impact on your credit score because each application will result in an inquiry on your credit report.

5. Monitor your credit report: Check your credit report regularly to ensure that all information is accurate to prevent incorrect information from negatively affecting your credit score.

By following these tips, you can gradually improve your credit score and credit card limit, allowing you to get better credit terms and interest rates when you need them. At the same time, maintaining a card can also help you obtain the financial support you need in an emergency.