I think Don meant to say FOOL proof, not full proof.

This home-brewed CRM is simple, almost foolproof and free. 

Not foolproof but better than the slick ones.

this is not foolproof but it gives me an idea. 

This is not foolproof, but it can be pressurized with an air compressor at low pressure, about 50-60 pounds.

This isn't 100% fool proof obviously.

https://www.biggerpockets.com/renewsblog/2013/04/14/best-real-estate-books/As for the first investment, I dont think there is a fool proof way of avoid losers since investment of any kind must come with risks.

That is a fool proof training method.

Seems most foolproof solution, especially if you also want to clear, um, non-humid but undesirable air from the bathroom.Air King AKDT60 Delay Timer Switch Turns your fan and light on simultaneouslyAllows you to turn the light off while the fan continues to operate for an additional preset timeOperation time for the fan can be adjusted from 1 to 60-minutes

Concentrate on what you know and  changes you see - you will see a major change coming long before I ever will,  long before anybody else will, because "X" is your passion; they are  what you are sitting around reading about all the time.2) You should  wait until you find something you are so thoroughly sure of, based on your  wealth of knowledge, and something that is so cheap, that buying it is a fool  proof as going over to the corner and picking up the money.