Just like any other profession there are different skill levels and specialties.

For the industrial building, we may tear down part of building and search for a medical office use or pharmacy chain, etc. 

From there, it is going to be different for everyone but I would try to find something that excites you and that plays off of your skill set!

I have had a different route and went from SFRs to MHPs since those are a better fit more my knowledge, skills, and abilities. 

In the short run this will cost low skill workers their jobs, but with support an retraining we can begin to see a household average income closer to what in needs to be in the 21st century. 3) The trades have been dying off.

@Frank Yaccarino To add more to the conversation you need good or even great negotiating skills, the ability to estimate repairs (or know a contractor who can), a way to get accurate comparables, time, and dedication. 

Both Elevate and Fit Brains offer engaging games to help strengthen skills in so many areas: problem solving, memory, math, language, speed, comprehension, etc.

I would focus on learning basic project management skills (this teaches you about keeping the triple constraints in line - money, time and quality). 

It takes a lot of hard work and mistakes but income potential is only limited by your ability to learn new skills and put in the work.

Often times, especially for young punks, its medical cause they don't have insurance.