Credit card promotions definitely have their benefits, but remember to check the fine print. Balance transfers at 0% are great, but check to see how long you have to pay it off at that rate (it could be only a few months). Also note that 0% is only on the amount transferred; any new purchases fall under the card’s normal APR. And pay attention: find out which purchases get paid off first if you make a payment—the 0% or the standard APR ones.