Book Categories
To follow is a basic beginning for choosing the category for your book. The list begins with non-fiction or fiction, then main category, then sub-category.
Your final category will look something like this: Art/Techniques and can have additions to it such as: Art/Techniques/Brush
There is also a website that might help Book Industry Study Group http://www.bisg.org/what-we-do-0-136-bisac-subject-headings-list-major-subjects.php
Nonfiction
Antiques & Collectibles
General , Americana , ...