Structuring a nonfiction book is an art form.
Simple to structure a How-To book about a process. Beginning. Middle. End. Done.
A history of transportation: a chapter per theme, Speed, Access, Fuel, etc – creating a structure like the spokes of a wheel.
A biography about… who? Oh, let’s make it up: a 30-year-old CEO of a digital currency firm that fails overnight, destroying people’s savings and hopes, isn’t best served by a chronological narrative starting with his kindergarten years – unless he rooked his playmates of their milk and biscuits. Then, a chronological sequence could build the criminal theme nicely.