"Kubernetes in Action" by Marko (Manning publishing) is my recommendation. Took me from someone who knows docker/docker-compose to someone who can handle Azure/AWS Kubernetes, understand the terms and design apps. Very good book.
I'll second that rec, same story... I wouldn't consider myself at all an expert based solely on that book, but it did give me a lot more confidence in branching out from a straight-and-narrow configuration, that I'd at least be able to know what to look up when I run into problems.
