Everyone in the U.S. can obtain a full copy of their credit report from all three Credit Bureaus once a year. In order to access your free credit reports, please use the below link that will take you to the Annual Credit Report website.
If you notice a discrepancy on your credit report, this is the best way to access detailed information regarding your tradelines.
AnnualCreditReport.com is the only official site explicitly directed by Federal law to provide them. Please reference the below screenshot from the Federal Trade Commission website.