1. Small cards are secondary cards that can be automatically phased. Just don't open it. The installment fee is quite high.

2, just open it, it's also a credit card, just like a big card. However, if other fees are used, 12 installments will be repaid automatically, and the handling fee is 0.5% of the total amount of each installment, which means a total interest of 6%.

3. The credit limits of two credit cards are shared. For example, both cards are 1 000, and the maximum overdraft limit can only be 1 000. If only one card is needed, activate one card.