Hi Bob, welcome back! In general you'd be interested in the Classical Guitar Classes
section, which, despite its name, is not about classes but is, as the description puts it, a "classroom" environment for exchanging Technical Questions & Answers, How-To's, music theory concepts, etc.
You would find some discussions on theory included in one of its subforums Classical Guitar technique
, for instance those with Inversions in the title here
(including one started by a certain Bob Vasquez
). And you may be interested in another of its subforums Analysis of Classical Guitar Works
for discussion of form and structure.
Of course it's always worth doing a search too, particularly with the Advanced search tool (accessible from the cogwheel icon at the top right of the page), which allows you to select "Search within: topic titles only" and "Display results as: topics", usually making the search results much more manageable.
Classical Guitar Forum.
"Experience is something you don't get until just after you need it." - Steven Wright