There's usually a clause like this:EFFECT OF ADDENDUM: THIS ADDENDUM AMENDS AND SUPPLEMENTS THE CONTRACT AND, IF APPLICABLE, ESCROW INSTRUCTIONS.

Simple electronics with simple instructions are key, for example.  

@Kyle GrimmDay job...Two fold: I provide private music instruction; primarily drum students with a couple of guitar students.  

I received multiple messages instructing me not to tell anyone it’s an Airbnb, restricted pool usage hours, had to pickup the key from a completely different location which made the check in more difficult (lock boxes apparently weren’t allowed on property- nor the ability to use electronic locks) and the experience overall wasn’t that great (even though the unit itself was nice).As an Airbnb owner myself I always struggle when I want to leave someone less than a 5 star review but my wife wants me to leave a 2 star.

I don't do it, I wouldn't recommend it, but I'm sure you could find some good instruction material on how to do it by connecting with people here.  

There's a warning in that, too, about this sort of cruelty: "The villainy you teach me I will execute--and it shall go hard but I will better the instruction."

So, even if you don’t want a degree, I would say participate in some class or learning program that requires you to do more than just receive information from an instructor.

I think in-person training can be more valuable as you get to participate in conversations with the class and hear anecdotal stories from the instructor, which all help cement important points.

I have found that this and other posts like it apparently revolve around what CNN / MSNBC keep instructing people to feel, think, believe.

To search, I've a link off of my profile to a short instructional PDF I wrote up (I got tired of explaining it) about how to search the commercial site www.LoopNet.com (which is the Zillow for commercial properties; 4units are commonlyconsidered commercial).