Practice Makes Perfect
I know I'm being Captain Obvious with this one, but there's no substitute for hands-on. Fortunately, it's never been easier to spin-up a Kubernetes playground where you can play around until you're a world authority!
I'm a huge fan of Play with Kubernetes (https://labs.play-with-k8s.com/). I love Docker Desktop, and I spin up test clusters on Google's GKE all the time.
Other options exist, and all of them are a lot simpler than how things used to be. I remember studying for my MSCE in Windows NT, and spending countless hours rebuilding NT domains from CD installs every time I trashed my lab. Things are so much simpler these days, and there really is no excuse for not getting our hands dirty.