Your website is built in a content management system called Concrete 5. These are pdfs created by dw to outline some process steps.
Concrete 5.9
https://documentation.concretecms.org/user-guide/editing-concrete-cms/the-toolbar
Concrete 5.8
Basic Editing for Concrete 5.8>> Logging in, setting up a new user, editing a page, making changes live
Getting started in Concrete 5.8
Concrete 5.6
Ecommerce - adding products and product details>>
Using Filesets>> Might be used in Gallery blocks that reference a fileset group of images