I have a similar situation right now on a deal i have pending.

Always pay on time, take care of their units as if they were their own, etc.

We ended up putting that on the backburner and using the typical Airbnb, Furnished Finder, Zillow, etc. routes to fill our units.

It seems often that people will dwell on books, articles, podcasts and other sources and really just need a bit of personal motivation by peers to get out there and take that risk to start gaining those Street Smarts. 

Yes, most large traditional lenders only focus on 1-4 units and other properties that fit into a box. 

I own my primary residence and want to build a DADU on the back of the lot.

I have read on the internet that some parts are and some parts aren't safe.

It does not sound like you're in that type of market based on what you shared.

Like someone else said, your RE licensure exam is going to touch on creative financing in a very surface level way, if at all.

On most deals we bid on, the bidding would start way, way above our strike price.