There will be many different classifications. 

Construction of 4 new apartments in a functionally obsolete historic building.

I'm now trying tenant cloud and really like the interface and functionality so far, but might give another a look since I have to advertise one of my properties soon.

This particular contractor sounds like the kind of guy that likes to be the general and guide the process, rather than play the part of a sub, functioning at the beck and call of the GC.     

Successful houses flippers need to perform one or preferably more of those 3 core functions.

Too bad RedFin or Zillow could not expand their functionality.

I figure if I mess up my first deal for some reason real estate has a way of correcting itself in the future , it’s easy to do because I compare it with the things we would waste money on that would really help us like let’s say you see a home that’s $100k, and it has to be functional for a bank to approve a loan for it, so I’ll risk the $20k I been saving to get it , bank loans 80k , & if you followed the 1% you should be able to rent for $1000.

Cozy.co has functionality for people to apply for your property and do the background and credit check through there. 

Soon, I started to find out that in order for me to be successful I needed to know the data and numbers that indicated and projected markets, prices, movement, cycles etc.Six months later and even to this day, I continue to learn the indicators, the data, the trends, the appreciation rates, the median price points, the median family income, the DOMs, the heat pockets, the neighborhoods classifications, the demographics and the many other pieces of information that will dictate where you need to invest and how.

Lots and lots of threads on this topic,  check out the search function.