Yeah, I did leave it a bit open and vague, looking back.
More so accessing the hub / UI from a PC or mobile device, like you described, more so than Z-type or LAN devices communicating with it.
I guess my train of thought at the time (without wanting to do the work 
) was to try and capture some of the basics of troubleshooting and common (or not so common) issues people can face and feel like their hub is not working, when in fact there is often something in the way it has been configured or the LAN has been configured.
So things like:
- Knowing to reserve an IP address in the router
- Looking at http://hubitat.local/ to find a hub
- Using the diagnostic tool in the mobile app to access a hub that may having some issues
- Knowing how to do a reset, what type to use and when to use it, what they each do, etc (I'm certain this will be in the HE doco, not suggesting we need to capture that here)
- Knowing the potential impact pulling the plug can have without doing a proper shutdown first
through to some of the less common issues with things like subnet / vlan setups, VPNs, jumbo frames, etc..... He says, like he knows what he's talking about 
