First, make full use of the interest-free period: credit cards have an interest-free period of 50 to 55 days. During the interest-free period, this is equivalent to an interest-free loan issued by the bank. As long as you make good use of it, you can get a lot of income.

Second, change the billing date to get a longer interest-free period: most banks support changing the billing date, and each bank can choose a different date and change times. You can check it online if you need it.

Third, clever use of points: credit card points can be used to exchange gifts in shopping centers, and we can make money by selling gifts. And some high-end credit cards can be converted into airline miles, hotels, delays and so on. To earn more income.

Fourth, take advantage of various activities in bonus hunter: Banks have cooperation with many businesses. As long as you swipe the bank's credit card, you will get a certain discount. You can get a lot of wool if you use it well.