Your credit score is like a grade for your borrowing history. A high score tells the lender you’re a safe bet, so they reward you with a lower interest rate. A lower score makes you look riskier, so they charge a higher rate to protect themselves. Think of it this way: a great score could save you tens of thousands of dollars over the life of your loan just by getting a better rate. It’s the single biggest reason to build your credit before you apply.

Yes, using too much of your available credit limit hurts your score. Even if you pay the bill in full every month, a high balance when the card company reports it makes you look risky. Try to keep what you owe on each card below 30% of its limit. For example, on a $1,000 limit card, try to keep your balance under $300 when your statement comes.

You should check your full credit report from each of the three bureaus at least once a year. Think of it like an annual check-up for your financial health. Spreading these free reports out (one every four months) is a smart trick. This way, you can watch for errors or strange activity all year long without missing a beat. Finding a mistake early makes it much easier to fix.

Credit Karma is a top choice. It’s completely free and shows your VantageScore from two major credit bureaus. The app updates weekly, is very easy to use, and explains the factors changing your score. They make money by suggesting credit cards or loans you might qualify for, but you never have to buy anything to see your score and reports.