So for numbers, check out-https://www.biggerpockets.com/renewsblog/2013/01/1...I'd say the next big thing after that, although the markets you mention don't go against this, is market fundamentals.

That which is difficult to buy is easy to sell or rent and if the governing fundamentals hold in the long term it will also tend to go up in price and rent over time.

I started investing at the age of 18 in stocks and Forex market, I learned tons about technical analysis and fundamentals through the years, and have always been a voracious reader of anything finance related. 

I realize comparing the two is apples and oranges as they are both fundamentally different strategies.

Diversifying into the public markets is fundamentally a liquidity play.

DFW real estate is on fire (strong fundamentals, TONS of new companies moving here, and new house starts not keeping up with people moving here), and low interest rates.

What about apartment buildings with good fundamentals, proper underwriting, 7-9 cap rates, that have $3-5k net cash flow per month.. any good argument to hold off on something like that?

You may want the money out for some seasoning time, so that the bank will consider that your money.Second, using loan as a down-payment gives you a lot of risks, as you are leveraging huge (the fundamental reason why banks do not like it).

The fundamentals don't change, just the scale and the number of numbers to the left of the decimal point. 

This is just a personal fundamental of mine that I have followed for 38 years.