Credit cards are popular but can lead to serious trouble if you aren't careful. A study released by MIT's Sloan School of Management found that people spend more when using credit cards than cash.

Credit cards made up about 35% of all transactions last year, according to Federal Reserve data. And yet, most people swipe without realizing the hidden perks and money-saving tricks their cards come ...

Could using your credit card lead to free money? Possibly — if you treat credit cards the same way you would a debit card. For example, you sign up for a cashback credit card offering 5% on grocery ...