Aras documentation sources

Hi, 
I am looking for an authoritative source for Aras documentation.

I assume that docs.aras.com is the main entry point. I have noticed, that some documents are duplicated, or have multiple was of accessing them.

For example in the top menu, below Help Center, there is an entry Documentation, which leads back the same site, docs.aras.com.

On the right side, there are links to "Knowledgebases" , which are gated behind an "Aras community/subscriber" login, but they also lead back to the same documents, that are already accessible from the main page.

Are there any other documents, that are not available though this page, specifically regarding administration of the Aras platform?

Thanks and best regards, 
Thomas