I also applied for a credit card. Personally, I think 2-3 cards are enough, and it is useless to add more, because every credit card needs an annual fee. Without an annual fee, there is no need to add more credit cards. If you have no control, you can't return the card at will, which will not only affect your normal life, but also reduce your credit history and even be blacklisted. Personally recommend China Merchants Bank's Everbright Credit Card. I'm using them all now. China Merchants Bank has been using it for five years, and its service has been very good, and there are many activities.