If you don’t own a credit card. it is a good idea to get one and start working on your credit history. Even if you make only a few purchases with it each month, it is good enough, if you pay it the right way. In order to have a good credit score, making a full payment is not enough. The timing is what makes a huge difference too. When you get your monthly bill, pay it in full right away. Each payment automatically builds your credit.