What reports are included?
As mentioned, the Reporting
section includes charts and tables with data describing how all the core Office 365 products are used. In addition, many in-depth reports have also been added to the Security & Compliance
section, which deliver detailed audits and accountability for organizations with regulatory compliance needs. There are very few products that are not covered, specifically—Bookings, Forms, Planner, StaffHub, Streams, and Sway.
Note
For a more-or-less complete list of all the reports included in Office 365 Admin Center, plus some helpful tips, visit https://support.office.com/en-us/article/activity-reports-in-the-office-365-admin-center-0d6dfb17-8582-4172-a9a9-aed798150263.
The dashboard
The dashboard shows tiles that highlight each of the more detailed reports. It's a useful place to get a bird's eye view of everything that goes on in your tenant.

Office 365 Usage Reporting Dashboard
In the previous screenshot, we see a tenant with very good adoption...