Rebuilding bad credit, or having no credit history at all, is tricky. If you don’t have a positive credit history to show that you pay your bills responsibly, it’s hard to get a loan, a credit card or even an apartment. But how can you build a history of responsible repayment if no one will give you credit in the first place? Several tools can help you improve your credit, including secured credit cards, a co-signed credit card or loan, or authorized user status on another person’s card.