I've gone through this now a few times to create several Archfey, as well as a Domain for my world. It's amazing. There are tables on tables to inspire you, as well as a solid amount of lore on the Feywild itself, an area that definitely needed more. Additionally, the examples they give at the end really showcase what you can make for your own world. If you were looking for a Feywild lorebook from WotC, this is the one. Now, there are about a dozen pages that are just extras from Wild Beyond the Witchlight, but that still leaves over 20 pages that are absolutely stuffed with step-by-step instructions on creating Archfey and their domains.