ASSUME-- dangerous.  

You need to know how to handle your tenants in dangerous situations where emotions run highYou should spend much time in educating yourself as to all aspects of this business.Office equipment is just as important as buying that house.You need to learn how to keep your rentals not just how to buy them.And a good financial software program to see where you stand financially.You should spend much time on Bigger Pockets :) because you will learn a lot of stuff for free. 

At the same time they are de-incentivized on educating the (now paying) audience they built on the drawbacks and dangers of following their program.

hello, aleko. i am a home inspector from the western new york area. the old cloth, 2 wire wiring is kind of dangerous, in my opinion. as stated earlier, the cloth gets brittle and can crumble with the slightest of touch. with rehabbing the place, you are going to disturb it, for sure. then, you have exposed wiring. fire hazzard. not to mention, a lot of this old wiring is made of aluminum, not copper, therefore, the heat it will carry without fail is far lesser that the copper type wiring. if you have an overload somehow, and the breaker doesn't trip, you are going to have a fire. the gfi's have to be grounded, thats the whole idea of a gfi. the g stands for GROUND. with the two wire system you have, where is the ground????

Obviously there are dangers with this type of play. 

There will be plenty of voices (the most dangerous of which are the ones in own our heads) saying "it can't be done, the market is saturated, there are no good deals left, etc."  

Now I know just enough about SD IRA's to be dangerous (to my self only, perhaps.)

Asking for charity right out of the gate when entering a new career is dangerous and you have an opportunity to nip that bad habit of his in the bud.

These squatters were so dangerous.

If it is coded in a black substance then there is a good possibility you have Chinese drywall.