Understanding the Lightroom Catalogue

I'm trying to make sure I understand the basic blocks of Lightroom as it relates to files on my computer, Catalog, Virtual copies and collections. See the following photo.

During the Import operation files are written to or added to the storage device, usually a drive. The LR Catalog adds entries that contain; image file location, meta data, image thumbnail, and other information need about the image file.  

During other operations in the various modules, eg. Library, Development, additional entries are made to the Catalog for the imported/registered file. 

When a photo is added to an Collection additional entries are made to the Catalog. 

When a Virtual created another entry is made to the Catalog. This new entry will contain any additional processing, Development, Libray, etc. but not change the previous  processing. If the virtual copy is added to a collection the catalog data for the virtual copy will have information about that collection.

At least that is what I understand.

    

This is the response from my post in Laur Shoe

This is the response to Laura Shoe, "

Laura Shoe That is correct, Larry. Good for you for working through it putting it in language/visuals that make sense to you - lessons you create yourself are lessons not forgotten!

"

Also the Lightroomqueen has an excellent explanation "What is a Lightroom catalog"