Content template files determine how content will be displayed on the page.
For example product or article listings on a category page or details on a product page or article page.   

Additional content template files can be added into the following sub-folders:

/category
/product
/article
/navmenu

The content templates in these folders can be selected when adding or editing the corresponding content type in the admin area.

Content template filenames must begin with ct_ and end with .php file extension eg. ct_myfile.php

Each content template folder should include a ct_default.php file.

Conditional statements can be used in content template files to output content and details differently
based on things like an id, assigned categories or selected template etc.
Custom sub-folders can be created under the relevant content types for any additional scripts. 