I can't seem to find any free options that will work for someone without a primary address in the US. 

Start with BiggerPockets Ultimate Beginners Guide (free).

But, I wonder if being an city-approved Airbnb host with a legit registration # is enough grounds to stand on legally if an Airbnb client reports/sues me because of, I don't know, a medical injury because of hitting their head on the short ceiling (even if I disclose info about the ceiling upfront on the listing).

If any Mortgage Brokers want to point me in the right direction to a bank that would work, feel free, but I also understand if you share your secrets.

I invest locally in Columbus so free to shoot me anything you're looking at, I'd be happy to provide an opinion! 

I am 24 years old and currently in the beginning stages of my real estate journey.My goal in life is to be financially free using real-estate to create generational wealth so that my family will always have everything they need.For the last four years, I have been watching BiggerPockets podcast on YouTube and doing my own research on real estate.

Feel free to DM me if you would like to check it out. 

-It's essentially free for landlords (at least with Guardian) once it's set up, because the cost of the service is included in the tenant's monthly water bill.

Also, working with a realtor with good social media exposure can be additional free marketing for your property.

@Steve Orluski you need to see the report that it came back clean, but I'm a little confused as to what happened.