At "Requirements -> Deploy a Kubernetes cluster", use vocabulary more related to GCP (e.g. stable channel).
At "Requirements -> Creating the Google OAuth application", point that the type of oauth2 client app must be web application.
At "Requirements -> Subdomain", rename section to "Create a Cloud DNS zone" and explain how it is used by the bundled cert-manager (e.g. it creates a TXT record to validate ownership of the FQDN and emit a certificate).
At "Installing Okteto Enterprise -> Creating the Okteto namespace", broken link to configuration example.
https://okteto.com/docs/enterprise/gke/
Small enhancements
https://github.com/okteto/website/pull/856
Suggestions