"The name Kubernetes originates from Greek, meaning helmsman or pilot. K8s as an abbreviation results from counting the eight letters between the 'K' and the 's'."
The Tutorials section on kubernetes.io has an excellent free, in-browser Kubernetes environment to try out.
Or Play with Kubernetes a simple, interactive and fun playground to learn Kubernetes by Docker.
Interactive Tutorial - Creating a Cluster
Check version
$ kubectl version
Check cluster information
$ kubectl cluster-info
Show all nodes
$ kubectl get nodes
Show deployments
$ kubectl get Deployments
Show Pods
$ kubectl get pods
Show Services
$ kubectl get services
Learn Kubernetes
50 days from zero to hero with Kubernetes | Kubernetes Learning Path
Architecting with Google Kubernetes Engine Specialization | Coursera
How to run a Kubernetes cluster on your laptop | Red Hat
Azure Kubernetes Service (AKS) | Microsoft