We have numerous events.

Numerous books, including one of my favorites, uses the sqft method.

I have had, however, numerous quality courses in different aspects of real estate, but have been slow to create partnerships or mentors to personally guide me in how to most safely and quickly profit from real estate investing.

There is no such problem with filling up your rentals with immigrants.Of all of the responses in this thread, and the numerous other threads on this forum that talk about similar topics, there is one common element to all of the responses. 

The code enforcement official said that it was a house that drew numerous complaints from the neighbors for unkept grass and other nuisances, and also for being a drug house.   

It almost doubles because I don't need to make another down payment - I'm only increasing my investment by the principal paid during the 2nd year so the denominator only increases slightly but the numerator doubles (aggregate cash flow).

Counting on appreciation in the vast majority of the country is just gambling and unwise.  

This is not investing, it's gambling.

To the point of @John Thedford I have lent money to people I trusted from meeting them numerous times and I lent it to them with first lien position and my name on the documentation (make sure you follow all those steps).

Some people making mistakes will get bailed out by dumb luck with appreciation but that is gambling and not investing.