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How can I improve my credit score if I am not paying bills or rent?
Buy a car. Vehicle loans, like mortgages, are installment loans. Credit cards are revolving lines of credit. In the US, your credit score factors in the different types of credit you have. Note that there are several methods for calculating credit scores, including multiple types of FICO scores. You could buy a car and drive for Uber to help cash flow the car payments and/or save for your next purchase. As others have suggested, you should be very careful with debt and ask critical questions before taking it on. Swiping a credit card is more about your behavior and self-control than it is logic and math. And if you ever want to start a business or make multi-million dollar purchases (e.g. real estate), or do a lot of other things, you'll need good credit.