What's the best homebrew book?

This will depend on your experience level and what you want to get out of the book. Here's my recommendations for the best homebrew book in different scenarios.

Beginner to intermediate
How to brew by Jon Palmer https://amzn.to/2TGwYIC
You can find the very old version at http://howtobrew.com
Camra's essential homebrewing by Andy Parker https://amzn.to/3c3OWLs
Home brew beer by Greg Hughes https://amzn.to/2XAyIEj

Intermediate to advanced
Brewing better beer by Gordon Strong https://amzn.to/2XA4ocH

Advanced to master
Water by John Palmer and Colin Kaminski https://amzn.to/2X1Ta1O
Malt by John Mallet https://amzn.to/2AcV2eY
Yeast by Chris White and Jamil Zainasheff https://amzn.to/2M2rVhi
Hops by Stan Hieronymous https://amzn.to/2TWZyFN

Recipes
Modern homebrew recipes by Gordon Strong https://amzn.to/2M2B6yk

Inspiration
Experimental homebrewing by Drew Beechum and Denny Conn is unfortunately currently out of stock but you may be able to find a used copy on ebay