I ended up investing out of state in a more landlord friendly / cost effective market.First thing I'd recommend is figuring out your investing strategy (single family / small multi-family 2-4 units) and attend some local meet ups to network with other investors to learn from their mistakes.

He felt spending more time disputing the rejection was not cost effective and i see his point but suspect airbnb recognizes this and uses it to their advantage.  

How can I effectively gather evidence to support my eviction case, such as documenting the disturbances, obtaining witness statements from other tenants, and documenting the tenant's interactions with my son?

I'm always looking for ways to provide value to my tenants while making our rental properties stand out & this seems like an innovative (and cost effective!)

Most alternative investments work just like pretty much all RE niches work when deployed effectively.   

Their personal problem does not effect your contract in any way.

This will effect your ability to obtain financing for quite a few years but may be worth considering.  

This alone was most effective.

If you didn't pick a tool that quite obviously works because of a factor completely unrelated to the effectiveness of the product, my course can't help you, ..

What makes it slow in this case is that you don't really start seeing real cash flow until after year five but it's more effective than rentals in that there is little to no maintenance.Sure you can live in a home while fixing it up with the intention of selling it for a nice profit later but I think many people are already doing that and the buyers of slow flips now also have that opportunity without having to qualify with a bank.