The vSphere 6 Hardening Guide is now GA and some changes have been made compared to previous versions making the document easier to understand.
The guide is intended for administrators who want to keep their VMware environments more secure following some best practices in terms of security.
VMware created a VMware Security Hardening Guides page where you can download guides and spreadsheets including script examples for enabling security automation.
vSphere 6 Hardening Guide is provided in spreadsheet format where you can apply some filters in order to see only the topic of interest.
You can find the full VMware blog post here.