We are finished with this book, but we only started with Kubernetes. It is so vast that no single book can cover even the core components. If we extend the scope to all the members of Cloud Native Computing Foundation (CNCF) (https://www.cncf.io/) project as well as third-party solutions that can be added, we'd need a series of books dedicated only to Kubernetes. To make things more complicated, the Kubernetes ecosystem is growing so fast that it is almost impossible to keep the pace. Even if we could somehow learn everything there is to know today, we would be left behind a week later.
There is an almost infinite number of combinations we can use to create and use a Kubernetes cluster. We can choose to stick only with core components, or we can combine them with third-party tools. We could choose to use only "vanilla Kubernetes", or we can adopt one of...