It definitely can't be don in a few days. It took me 2-3 months to go through everything and run my own cluster at home. And yes, you need to go through about every major concept (architecture, object type, API, authentication, services, deployments, updates, etc, etc, etc) in order to make sense of Kubernetes overall. It's a very complex software. You can learn a simple programming language like Go in a couple of days, but definitely not Kubernetes.