Catalogs Files to Keep and Catalogs Files to Delete

How and where do I find and identify the latest working Lightroom Catalog (I think it is "Lightroom 3 Catalog-3.lrcat") and its associated files? And which of the old files in that folder can I delete?

For Windows (not sure about Mac), in LR go to Edt menu, Preferences... and in the general tab it tells you which is the default catalog.  Under Presets tab it tells you where you've stored presets (click "show Lightroom presets folder"). 
The Lightroom folder (where your catalog is, go to catalog settings, general tab, and click show) also has a Backups folder for weekly backups of the catalog - keep as many or as few as you like.  There are previews - no need to keep them, they're recreated if they're not there.  The Lightroom settings folder is also in the Lightroom folder (If you've selected "Store presets with catalog" in the presets tab above) which includes your own presets.  In each settings sub-folder are folders for Lightroom presets and your presets. 

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    mattmakesvidiots wrote:
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