Well, I make it a general habit not to use credit cards. I actually didn't have one till recently when I got one of those Best Buy ones so that I could pick up a new TV right away and get the 16 month no interest. I'm paying it off real quick anyways and then I plan on either canceling it or locking it away somewhere hard to get to. Normally I would not have had to use one had my company not had to do a 1 month layoff for the first time in 14 years at the same fucking time as I was moving into a new place and needed a bunch of new furniture and shit. Talk about timing.
Don't cancel your credit card. Don't ever cancel any credit cards. If you must, just don't use them. You need longstanding credit history to establish and maintain a good credit score.
Ideally, everyone should get a credit card as soon as possible in their lives as long as they're responsible.