Concrete would be a good floor as long as you pour a stemwall that's about 2 feet high. Local grass seed farmers do this to keep rats out of their seed. Put metal siding on the walls overlapping the concrete to prevent them from getting a "handhold" if they manage to climb the stemwall. But...
Yes - exactly right. The hot wire (typically black) and the neutral (white) go to the power screws on the light fixture. Sometimes you'll have screws of different colors. The "golden" or brass colored screw is for the hot wire, the silver colored is for the neutral. This is important because...
Like any device, GFI's can fail (I've had it happen many times, though they usually fail open or more commonly by nuisance-tripping, a power-on failure happens occasionally) or be mis-wired, negating the protection the circuit is supposed to provide. If they do, a grounded circuit is your next...
This is a brilliant (no pun intended) idea and a wonderful use for an old cookie tin. However, it has a potentially deadly flaw and I do not exaggerate. Using a two conductor wire enables the potential failure mode of having the hot wire come loose and touch the metal of the can. If that...
The term "lazy" especially when used in the name of a farm doesn't refer to the ambition of the owners. It's a leftover from the days when all your stock were branded. Lazy in that context refers to a letter, number or sybol oriented 90 degrees from normal, thus appearing to "lay on its side"...