when i run this command mentioned below kubectl get po -n kube-system I get this error :: The connection to the server localhost:8080 was refused - did you specify the right host or port?
localhost:8080 is the default server to connect to if there is no kubeconfig present on your system (for the current user).
Follow the instructions on the page linked. You will need to execute something like:
gcloud container clusters get-credentials [CLUSTER_NAME]