REI is fascinating, and also most of the time with a lot of risks, sometimes for those experienced, but more for inexperienced with cash to invest, and more often with very limited individuals with cash or credit.  

Residential, Multi Family, light Industrial, city office, life science?

It's largely a junk science (shouldn't even be called a science) and the closest thing we have to modern-day astrology.

One fascinating example from The Big Short is this Mexican immigrant strawberry farmer living in California that was able to get a mortgage on a $750,000 house based on a stated income of around $15,000 annually.  

Compare this to heuristic, a similar concept used in mathematical discourse, psychology and computer science, particularly in algorithm design.There are so many MORE expenses and benefits to a rental property that are not even covered in the 50% "rule of thumb."

It was fascinating.

One thing that's fascinating is that the whole classification thing is 'in the eye of the beholder', as the disagreements show, especially in the middle rankings.

My intention is to share and lean more and and balance my life. like other think real estate investing is not a rocket science, actually it requires less efforts and get more benefits. 

I agree adequate training is a MAJOR issue...while at a local branch (not ours) settling a parents' estate/RE property issue the 'kid' (who graduated political science 6 months ago, but was fully trained by the Bank), began to lecture me on refinancing some of the free & clear properties we held.

But I have always been fascinated by the real estate industry.