Is there a definitive source for learning to be a ColdFusion Server Admin?

I am not aware of any real training programs per se (If there is, I would also like to know about it)... I think it's the kind of thing most people learn by reading the documentation https://helpx.adobe.com/coldfusion/configuring-administering/administering-coldfusion.html and through experience. There is https://www.cfguide.io/ that has some good information and Charlie Arehart has a lot of articles and lists of resources that are helpful https://www.carehart.org/... and there's always this Slack group, stack overflow, etc if you have specific questions.