Exploring the Microsoft Graph

Another skillset for Office 365 Admins... even though you might never intend to program against the Graph, you should take the time to understand its capabilities...

The Microsoft Graph is a common programmatic interface to Office 365 and other data, including Azure Active Directory. The Graph Explorer is an excellent guide to help programmers understand what is possible with the Microsoft Graph and how to interact with the various endpoints.
https://www.petri.com/exploring-office-365-graph-explorer