Some FTers have little need to be concerned about their FICO scores and credit worthiness. They do not expect to borrow any money in the near and medium term.
If you are
not one of those folks, if you want to maintain a good credit score, read the Credit Card FAQ
here.
One of its key points is that you should not close excess fee-free credit card accounts. If you hang onto old credit card accounts, it drives up the average age of all your accounts...and this helps your FICO.