If your score is below 500, you've likely dealt with collections, charge-offs, a bankruptcy, or a combination. Lenders see you as very high risk. Most traditional credit products are off the table. But "most" isn't "all."
What you can get:
Secured credit cards. These require a cash deposit — typically equal to your credit limit. You put down a deposit, and that becomes your limit. If you don't pay, the issuer keeps the deposit. Because of that collateral, most secured cards don't have a minimum score requirement. This is your single best tool for rebuilding.
Credit-builder loans. These work in reverse — the lender holds the loan amount in a locked savings account, you make payments, and you get the money at the end. Several credit unions and online lenders offer these with no minimum score.
Prepaid debit cards. These don't build credit, but they give you a payment method if you can't open a checking account.
What you probably can't get: Unsecured credit cards, personal loans from mainstream lenders, auto loans from banks or credit unions (dealer financing at very high rates may be possible), mortgages of any kind.
What to do at this level:
Open one secured credit card. Use it for one small recurring bill. Pay the full statement balance every month. Do this for six months without missing a payment. Your score will move. Don't apply for multiple cards at once — every hard inquiry dings your score slightly, and approvals are unlikely anyway, so you're just taking damage for nothing.
Under the Fair Credit Reporting Act (FCRA), you're entitled to dispute any inaccurate information on your reports. At this score range, check all three bureau reports at AnnualCreditReport.com. Errors in collections or balances could be dragging you down more than the legitimate negatives.