Could you please provide some details about ProductTemplates.
Is ProductTemplates related to product catalog?, I am new to SugarCRM, would like to know all modules, please help me to understand it.
You are correct. The code found in /modules/ProductTemplates is the module for anything you see in the app called "Product Catalog". Even if you hit the url #ProductTemplates you'll see it takes you to the list view for "Product Catalog".