Beat your head against the wall multiple times until it clicks.
IMHO - the best way to learn anything is to just sit and hack away, if you wanna get up quickly - read through the docs, make sure you understand the concepts and then grab k3s (or run k3d locally in docker) and deploy something to it. WordPress is a good start.
Take a look at: roadmap.sh/kubernetes
If you wanna go all in: https://github.com/kelseyhightower/kubernetes-the-hard-way
Oh, and both: "Kubernetes up and Running" and "Production Kubernetes" are great books.