giansera wrote:I was wondering if I should get another card, like the Amex, with no annual fee.
If you feel like you want better rewards, different payment networks, building relationships with various financial institutions and so on, why not?
giansera wrote:Will this help to build my credit? I didn't understand if it is better to have more then one card.
Temporarily getting another account means additional hard inquiry and reduced AAoA which both hurt credit (score). However in the long run your history does become more robust--you have several accounts and can manage them wisely, which is most lenders want to see. Also when having multiple aged accounts, if you apply for another one your AAoA could suffer less.
There is no need to apply for many accounts at the same time though--this shows high risk to lenders as they would think you are desperate to credit.
giansera wrote:Also, is it true that once you got a credit card you should never closed it?
This is FALSE.