nerdctl - a docker-compatible CLI for containerd
nerdctl [OPTIONS] COMMAND [ARG...]
Options you will use
-n, --namespace NS- containerd namespace (default "default"; Kubernetes uses k8s.io).
-a, --address ADDR- containerd address (default /run/containerd/containerd.sock).
Try nerdctl in a real terminal Free, in your browser - a real Ubuntu terminal to try it in, with missions that check your work.