Unofficial Google Cloud Certified Professional Cloud Architect Study Guide

You have four hours to go before taking the GCP Professional Cloud Architect exam. What do you do? Why, read this book, of course!
Most courses and books on the matter overload you with stuff that will never appear in the exam (good for your knowledge and understanding though). This book ruthlessly focuses on exactly what you need to know to pass this exam. No long-windedness, reams of documentation, or deployment walkthroughs.
In this book I also walk through all the three case studies that will appear in the exam, and provide some analysis so that you will be better prepared for the case study questions.
Some prerequisites
You have dabbled with Google Cloud for at least 6 months
You know what a service account is in Google Cloud
You have architected an application before, no matter how large or small