Helpful user contributed resources
From ZoneMinder Wiki
FAQ
Installation
Ubuntu specific guides (currently more updated than official guides)
Common problems migrating from old versions to new versions
API installation/validation guide- (use the link above first, if you face problems, refer to this link)
Using a dedicated Hard Drive - Adding HDDs.
Single Board Computers - ARM devices.
GPU passthrough in VMWare - Notes on using GPUs with Zoneminder running in a virtual machine
Supported
MobileDevices - View ZM from your phone.
Third party
Utilities - Large list of software for ZM
Infrared Leds, Cameras, DC-DC converters etc
External resources of information related to ZM
Community docs
Various Learnings from getting Zomeminder 1.28.1 working well on Ubuntu Server 14.04
CCTV Laws
California Report on Public Video Surveillance