Free Kubernetes Courses https://www.edx.org/
Interactive Kubernetes Tutorials https://www.katacoda.com/courses/kubernetes
Learn Kubernetes the Hard Way https://github.com/kelseyhightower/kubernetes-the-hard-way
Official Kubernetes Youtube Channel https://www.youtube.com/c/KubernetesCommunity
Official CNCF Youtube Channel https://www.youtube.com/c/cloudnativefdn
Track to becoming a CKA/CKAD (Certified Kubernetes Administrator/Application Developer) https://www.cncf.io/certification/expert/
Awesome Kubernetes https://ramitsurana.gitbooks.io/awesome-kubernetes/content/