1. One shelf of "frequently used favorites" in kitchen, alphabetical by author: mostly vegetarian / vegan / pescatarian, a few international, a few general, etc.
2. One shelf of vegetarian / vegan / vegetables in bookshelf, alphabetical by author.
3. Partial shelf of general / basics in bookshelf, alphabetical by author.
4. Partial shelf of international (alphabetical by country)/ regional (alphabetical by area) in bookshelf, alphabetical by author within each subsection.
5. Partial shelf of baking / pastas / salads / soups in bookshelf, alphabetical by author (several soup & bread)
6. Partial shelf of proteins (fish / chicken) in bookshelf, alphabetical by author.
7. Kindle - utter chaos, as sort by author and subfolders are not options. If I'm looking for a specific title, I search by keywords from title or author's name (which can require choising from a short list). Books are organized in alphabetically organized folders. To facilitate browsing, a single cookbook may be included in multiple folders. Cookbooks are organized by "Cookbooks-" followed by Basics, General, International & Regions (multiple folders, e.g. French, Italian, California, etc.), Type (again multiple folders, e.g. Bread, Casseroles-Soups-Stews, Proteins, Veg (Vegetarian / Vegan / Vegetables), etc.), Gadgets (slow cooker, etc.), Restaurants (includes celebrity chefs, bloggers, etc)., Memoirs, and folders for extended series such as ATK. There are also folders for a simple count of all cookbooks, and another for all EYB books.
Other folders are for library books (currently checked out and previously checked out), and for various fiction and non-fiction genres, but that goes beyond this reply.