add en pages

content/en/docs/reference/kubectl/conventions.md

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 title: kubectl Usage Conventions
 reviewers:
 - janetkuo
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 Recommended usage conventions for `kubectl`.
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 ## Using `kubectl` in Reusable Scripts
 
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 * You can use `kubectl apply` to create or update resources. For more information about using kubectl apply to update resources, see [Kubectl Book](https://kubectl.docs.kubernetes.io).
 
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