How much does getting a credit card raise your credit?

I have bad credit already so Im going for the kind made especially for bad credit. I dont know if it makes a difference what kind of card it is...|||See your replies under the other posting.|||Responsible use of a credit card is one of the best ways to improve your credit. Here are some of the fastest ways to boost your credit score: http://moneygirl.quickanddirtytips.com/r鈥?/a>|||Using a credit card, making all the payments on time and not spending over the limit is what improves your credit.