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1. Builds up your credit rating.  If you never use credit cards, you will run into problems when looking to do things like getting a car loan or a mortgage.

^^^This is 100% true and by far the most important reason to responsibly use credit cards, and it applies to everyone who is not independently wealthy.  I know several people who never wanted to use any line of credit and now that they are in there twenties and thirties they can't get approved for a new car or home even though they have good jobs because they have no credit history.  Sucks so bad.