This guide is an operating manual for anyone who writes, approves, or challenges advertising. It sets out the deception and unfairness standards in element form, then treats substantiation as the discipline it actually is, with evidence expectations by claim type. Separate parts address disclosures, endorsements and influencer marketing, comparative advertising and the competitor suit, pricing and negative-option offers, environmental and origin claims, and interface design practices regulators treat as unfair. Enforcement is covered by channel, from FTC civil investigative demands through self-regulatory challenges and state UDAP class actions. The guide closes with review-process design, a claim register structure, recordkeeping standards, and a response protocol for demand letters, warning letters, and platform takedowns. Every rule is stated so a marketer can apply it and a lawyer can defend it.