The most helpful book I've read on it is probably "Exploring the World of Lucid Dreaming." Dreams are actually the subject I've probablt written about the very most on Medium if you're at all curious. https://benulansey.medium.com/list/lucid-dreams-and-vivid-dreams-89c1bedefc90

Many of them are just first person accounts of some of my experiences and are a little more niche in their appeal, but in a few I talk a more broadly about my thoughts on dreams and offer some advice on lucid dreaming and dream retention. Lucid dreaming has been an absolutely life changing pursuit for me and even a couple years into the process it blows my mind that it's even possible--and that so few people even know what it is.