While this one may seem like common sense, it is easy to use a credit card to pay a credit card with balance transfers. For those who plan to pay off the transfer balance in a certain amount of time offered at 0% interest, this may seem like a good idea. If the balance is transferred to save money and the account is closed, then it may work. If the account is not closed, all it does is shift the b balance from card to card, causing more charges in interest to be charged, costing more money in the long wrong. If credit is still open on the new card after the balance transfer, it opens more debt and costs more money.
Only use balance transfer features to save money on interest if you know you can pay the balance before the interest kicks in or the interest is lower than the other card was. Do not leave the card the balance is transferred from open, and do not use any available credit on the new card if you want to reduce the debt.