.- You need supplemental insurance to protect yourself.

There is obviously a formal lease, and we also supplement with a room mate agreement which outlines the more specific things like overnight guests and expectations in dispute resolutions/ cleaning/ care for the home and appliances, etc.I haven't received one formal "LL request" email yet, other than a formal 30 day notice in the event of a move out, which is usually after they've come talked to me in person about it to begin with. if there's an issue, it tends to be pretty limited to "hey, we have this shower rod falling off"... which im usually here to deal with (and tbh most of the time they like to fix it up with me), and it doesnt need to turn into a big thing. as for keys, i have the house on a yale smart lock, so 'handing over keys' is just official move out, walkthrough of the room for damages, and then I can delete their access code and access to the smart home systems without having to re-key the house. 

We BRRRR 8-10 per year and the flips supplement the money left in the BRRRRs. 

There are other forms of winterizing like insulating plumbing, sealing door/windows with rubber gaskets, installing storm windows/doors, setting up heat lamps or other supplemental forms of heat in basements, etc.

We BRRRR 8-10 per year and the flips supplement the money left in the BRRRRs.

This K-1 information is then used to report your share of the partnership's income or loss on your personal tax return (Form 1040) using Schedule E (Supplemental Income and Loss).

The whole appeal in REI was to maybe create a small business on the side with my spouse as a way to: eventually secure supplemental income, start building equity in RE and maybe creating a small business together in RE that would help us obtain financial freedom after hearing how risky things can be, I’m trying to learn: what are other RE investors doing to make money despite the risks around home repairs, vacancy, additional expenses (i.e property managers), etc.

You may want to look into forming a captive insurance company, which acts as a supplement to traditional insurance.

I'm currently reading a book about emerging markets, you're supplemental answers would be great. 

Once built use one home to live in and sell the other(s) to supplement the cost of the primary home?