How to list applied Custom Resource Definitions in kubernetes with kubectl
kubectl get customresourcedefinitions, or kubectl get crd.
You can then use kubectl describe crd <crd_name> to get a description of the CRD. And of course kubectl get crd <crd_name> -o yaml to get the complete definition of the CRD.
To remove you can use kubectl delete crd <crd_name>.
Custom Resources are like any other native kubernetes resources. All the basic kubecl CRUD operations works fine for CRDs. so just use any the below commands.
kubectl get crd <name of crd>kubectl describe crd <name of crd>kubectl get crd <name of crd> -o yaml