Cleaning up your Kubernetes environment
$ kubectl delete crd guestbooks.charts.helm.k8s.io
Before you proceed with the next clean-up steps, note that one of the questions posed later under the Questions section will challenge you with writing your own Helm charts to implement the chart designs discussed under the Using Helm to manage Operators and CRs section. You may want to postpone these steps to test your implementation.
To continue the clean-up, run the following command to delete your
$ kubectl delete ns chapter8