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.
A page that is primarily about one 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):
来源：https://stackoverflow.com/questions/53266384/what-is-the-schema-org-markup-for-a-group-of-things