This tutorial is an introduction on how to install PRTG Network Monitor and setting up sensors using PRTG's auto-discovery.
(6:35 min)
This tutorial describes PRTG's notifications and how those can be used to make the administration of your network easier.
(4:07 min)
This animation video describes how PRTG monitors your local network as well as remote networks using different types of probes.
(2:17 min)