Learn about Permissions on Google Cloud Platform by Jeff Peck.
From the post:
Do your co-workers ask you “How should I set up Google Cloud Platform projects for my developers?” Have you wondered about the difference between the Project Id, the Project Number and the App Id? Do you know what a service account is and why you need one? Find the answers to these and many other questions in a newly published guide to understanding permissions, projects and accounts on Google Cloud Platform.
Especially if you are just getting started, and are still sorting out the various concepts and terminology, this is the guide for you. The article includes explanations, definitions, best practices and links to the relevant documentation for more details. It’s a good place to start when learning to use Cloud Platform.
It’s not exciting reading, but it may keep you from looking real dumb when the bill for Google cloud services comes in. Kinda hard to argue that Google configured your permissions incorrectly.
Be safe, read about permissions before your potential successor does.