Pick the piece you’re best at, for the people you care most deeply about serving, at the moment in their journey where you can really help them, and forget about everything else. These crucial decisions will define your book’s scope. The scope of a useful book is like the executive summary of a new business. It’s an as-brief-as-possible description of what it is, who it’s for, and why they’ll pay for it: Scope = Promise + Reader profile + Who it’s not for + What it won’t cover
