Do I need to have an open credit card?

Many people who have bad credit have had bad experiences with credit cards in the past and understandably, they are afraid to open up a new credit card because they don't want to get into debt again. However, they are missing out on easy points to their credit score. The credit score is calculated using a debt-to-credit ratio. This means that if you have no open revolving credit (i.e. credit cards), your credit score is going to be very low because when you calculate anything