Any good source for Power BI Enterprise Gateway Documenation or Video?

[G-Squared]

This product changes so quickly I find it difficult to locate "current" information. Is there an up to date source of Help/HowTo/Documentation around the Power BI Enterprise Gateway?

I found it easy enough to set up but I need more words to tell me what I'm supposed to do to make sure that my reports are using data supported by "refresh" from the gateway.

The personal gateway works fine and makes sense because I'm scheduling a refresh of a data set. However, the Enterprise Gateway is specific to a "data source" which is defined to a SQL Server (not a data set). 

If my data source happens to be configure for the same SQL Server/DB as the "data source", will it get refreshed?  I'm missing the idea and would be happy to RTFM.  Thanks

[Greg_Deckler]

https://powerbi.microsoft.com/en-us/documentation/powerbi-gateway-enterprise/

https://powerbi.microsoft.com/en-us/documentation/powerbi-gateway-enterprise-indepth/