Kubernetes: From Basics to Guru is a masterclass made up from the following products and associated GitHub links:

Building and Managing Microservices with Kubernetes and Istio
https://github.com/sandervanvugt/microservices

Automating Kubernetes with GitOps
https://github.com/sandervanvugt/gitops

Getting Started with Containers
https://github.com/sandervanvugt/containers

Kubernetes and Cloud Native Associate (KCNA)
https://github.com/sandervanvugt/kcna

Certified Kubernetes Administrator (CKA), 3rd Edition
https://github.com/sandervanvugt/cka

Getting Started with Kubernetes, 3rd Edition
https://github.com/sandervanvugt/kubernetes