
1) it depends how good or how bad. If it’s too bad it could be harder for you to get a car loan or if you want to get a mortgage to buy a house you’ll have a hard time getting on OR the rates they offer won’t be as good. The idea is that bc you have bad credit you’re more of a liability to loan money to, so they want more to compensate for that risk.
2) Pay your bills on time. Lots of different stuff impact your credit score, but off the top of my head stuff like utilities, rent, credit card bills, car payment, etc. There’s not a “quick fix”, as far as I’m aware the only thing you can really do is pay your bills on time for a couple of years and your credit score will improve over time
When you open a credit account there’s a certain $ amount you’re approved for each month. The amount of money you’re approved for depends on your credit score. Basically you pay for stuff with your credit card & you get a bill at the end of the month for however much you spent PLUS interest (the interest or “APR” also depends on your credit score). Pay off that bill every month & that’ll show up on your credit report —> better credit score over time.