<prompt> Human: Hello,I only have 1 credit card at the moment, and Ive been satisfied with it so far. It has a 6,000 limit, and Ive had it for the past 5-6 years. The APR is around 7.24 for any purchases. I dont reach the limit of my card that much. Should I open up another credit card to increase my overall credit line?? Are there any benefits? Will I be able to get the same low APR as I do with my current card? Im going to turn 26 years old, soon. Any advice will be appreciated. Thank you, personalfinance redditors.  <response>: Having more than one card is useful when the bank makes a mistake and declines your card you have an alternate available. 