Remember you, from another thread, saying you were only 21 yrs old.
Friend of teh family was President of regional bank, this is how he explained credit, to me, when I was your age, decades ago.
Get a credit card. Use it. Pay it ALMOST off, each month, but always carry over a slight balance. Roughly, 10% of your available credit limit.
After doing this for a few months, you score should rise.
After one year, get a better credit card. Better being lower interest rate.
Keep your original credit card. Use every once in awhile, never carrying more than 10%.
Use your new card, for everything and pay it off, every month, except for that last 10% of your limit.
Credit is essentially a Game. They want to know how long you have been playing the Game. IE: how old are your accounts.
How well do you play the game. IE: How much credit "Debt Payment" can you handle. NOTE: that is not always related to income.
Think of it as Poker, some play $5 limit, some play $20 Limit, some play $100 limits . . . you get the idea. Where do you play and how do you play.
How much debt do you carry, month to month.
Keep your credit inquires low, applying for credit causes a credit Inquiry.
Too many Inquires looks like you NEED new credit.
Keep a couple account, for no other reason than their account age.
Until you buy a home, credit card is a great way to achieve this.
If you got questions, ask. we will try to help.
Be careful it is easy to get into credit trouble.