Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

How can I improve my credit score if I am not paying bills or rent?
For those who are looking to improve credit for the sake of being able to obtain future credit on better terms, I think a rewards credit card is the best way to do that. I recommend that you only use as many cards as you need to gain the best rewards. I have one card that gives 6% back on grocery purchases, and I have another card that gives 4% back on [petrol] and 2% back on dining out. Both of those cards give only 1% back on all other purchases, so I use a third card that gives 1.5% back across the board for my other purchases. I pay all of the cards in full each month. If there was a card that didn't give me an advantage in making my purchases, I wouldn't own it. I'm generally frugal, so I know that there is no psychological disadvantage to paying with a card. You have to consider your own spending discipline when deciding whether paying with cards is an advantage for you. In the end, you should only use debt when you can pay low interest rates (or as in the case of the cards above, no interest at all). In the case of the low interest debt, it should be allowing you to make an investment that will pay you more by having it sooner than the cost of interest. You might need a car to get to work, but you probably don't need a new car. Borrow as little as you can and repay your loans as quickly as you can. Debt can be a tool for your advantage, but only if used wisely. Don't be lured in by the temptation of something new and shiny now that you can pay for later.