I love reading, and if you are starting in this field or maybe trying out what do you want to do with your tech career, I figure this small list could help you to clear some doubts or maybe inspire you to help implement or optimize your organization.
The Pheonix Project - Gene Kim, Kevin Behr, and George Spafford
Yes, this book is mentioned a lot when talking about what's the best novel if you are working on IT especially management stuff. It is full of case studies and sometimes when I am reading it the stories feel like my own personal diary on my day-to-day work.
Accelerate: Building and Scaling High-Performing Technology Organizations - Nicole Forsgren, Jez Humble, and Gene Kim
Honestly, this book isn't that revolutionary if you already working in the field for a while but if you just starting in the field this is a good introduction to DevOps that it's short and accessible enough to be consumed.
The Twelve-Factor App - Adam Wiggins
Either on a big company or a small startup, this guide of software development is what I use in practice. I consider this a list of best practices on building software for the cloud.
Building Secure & Reliable Systems - Heather Adkins, Betsy Beyer, Paul Blankinship, Piotr Lewandowski, Ana Oprea & Adam Stubblefield
Made from people working at Google, this book is a great reference point for me to evaluate whenever I build it up to standard from a security point of view, It is full of valuable advice and relevant information just maybe try don't read the whole thing. It's a long book that could be much shorter in my opinion 🤣.
I hope this list could be useful for you to start learning about DevOps, I am sure there are more good book recommendations but this is my pick for starting out.
Good luck and have fun!