The credit report is the most consequential document in your financial life that someone else writes about you. It is also one of the most error-prone. Credit reporting companies generally must investigate disputes within 30 days, with limited 45-day exceptions. Debt collectors must give validation information, and if you dispute in writing within the validation period, they must pause collection until they respond. Collectors also cannot call you at work if you tell them you are not allowed to get calls there.
Almost every protection in this guide is a switch you have to flip. It will not flip itself. The work is to learn which switches are yours, and to flip them with a steady hand.