Apple has published a new page that goes through all of the settings and commands available via MDM and explains many in much more detail. This is available at http://help.apple.com/deployment/mdm/. The new guide is a great addition to the work @Mosen has done at https://mosen.github.io/profiledocs/ in terms of explaining what each setting, command, and payload do. And let’s not forget the definitive MDM protocol reference guide, available at https://developer.apple.com/library/content/documentation/Miscellaneous/Reference/MobileDeviceManagementProtocolRef/1-Introduction/Introduction.html#//apple_ref/doc/uid/TP40017387-CH1-SW1.
Overall, I’m excited to see so much information now available about MDM, including how to develop an MDM properly, what each setting does, and now what you should expect out of an MDM!