There are conventions in REST APIs that help users(developers) quickly understand how the resource works. This is the fundamental concept of REST.
A REST API provides operations on resources and resource collections.
It should be readily apparent from just looking the paths in the REST API what the resources are.
Resources are generally (but not always) contained in resource collection, and resource collections are identified by static path segments that are followed by a path variable. The path variable is the "identifier" of a resource within the resource collection.
The resource collection name (the static path segement) should be a plural noun and the singular form of that noun is the type of resources in the collection.
There is a standard set of operations defined in REST - Create, Read, Update, Delete, and List, often referred to as "CRUDL" operations.