What is the Schema.org markup for a group of Things?

Question

I understand how to do schema markup for a specific thing (a shoe, for example). But how do you do the schema markup for a group of things? "Men's Running Shoes" for example.

Answer 1

A page that is primarily about one thing:

ItemPage mainEntity Thing

A page that is primarily about a list of things:

CollectionPage mainEntity ItemList

A page that is primarily about a collection of things:

CollectionPage mainEntity Collection

A page that is about multiple things (where a list/collection isn’t needed or doesn’t make sense):

CollectionPage hasPart Thing