Provide a safe and clean space for tenants, take pics when you install (every 10 years) or change batteries on smoke/carbon detectors, have them sign off on a movein doc that says windows open, smoke detectors, test.

I mostly blame my naiveness in humanity and eagerness to get the project going.. here are many of the items (not all):All 3 HVAC units went out in the first 3 monthsBoth "high end" endless water heaters died within 6 monthsThe 1918  LEAD pipe entering the home burstSome lighting was found to be battery operated instead of electricUnfortunately a rock from DC water entered the piping which resulted in multiple cancelations and major repairsNo insulation between the upper and lower unit resulting in numerous noise complaintsPitch incorrect in back yard which results in floodingPlumbing piping incorrectly sized throughout homeAll gas lines removed and everything replaced with electric to pass city inspection easier (only house on the st without gas)Oh yeah, furnishing a two units that can sleep a total of 16 people is not easy nor cheap (especially with a puppy).

I want one with a battery pack or solar panel that runs on cellular (not WiFi) and has two way communication.

All the good ones have a robust accounting module as part of the platform, so you'll be good to go. 

I'm sure battery backups would help with that at night. 

Do you think (maybe for non-BP folks) that some fundamental content about income and taxes and the different areas of residential real estate should be included in one or mode modules, and if so, what would you suggest to cover?

Rules are good, just make them standard ones that other good landlords are doing.An example of what not to do: don't say you're going to do quarterly inspections (only do inspections every 6 months max and just say it's to change smoke detector batteries and check to see if there are any plumbing leaks and you're in and out in 5 minutes). 

We did install one lock( doorlock) and the battery has been good. 

You hate to send someone to fix the heat to find out the tenant doesn't know how to change the battery on the thermostat.... but that is the risk you take. 

There were plenty of pre-recorded modules, weekly "coaching" calls and a meet and greet event.