Get the list of nodes for the cluster:
kubectl get nodes -o wide
Getting the same, but in a verbose way:
kubectl get nodes -o wide -v 8
Get a list of namespaces:
kubectl get namespace
Get all the resources from kube-system namespace:
kubectl get all -n kube-system
Get all the resources from all namespace:
kubectl get all -A
Create your own namespace:
kubectl create namespace liviu-costea
Get current context name:
kubectl config current-context
Switch that namespace to be the default one:
kubectl config set-context <<context-name>> --namespace=liviu-costea