Hydroponics people UNITE

I would like to try my hand at hydroponics.
i saw a pic of a system where a PVC pipe was used and it was setup along a wall. HOW INSPIRING!
I do not understand how a hydrosystem works. All the pics i have seen are hard to see.
Can someone explain how to build a basic one?
Won't the roots get rotted hanging in water 24/7? If out of the water wont the roots dry out?
thanks
I would like to know how it all works so i can design a stsyem thats right for me instead of designing a system to fail.
thanks in advance.

isnt there anyone on that can answer?

there are posts all over showing how to maker a hydro setup, do some searching. If you do, youd see the roots dont sit in water all the time

Well my roots are submerged in water 24/7....works fine for me and many others....its all about dissolved O2. Check out my logs for an easy setup.

thanks Cyclonite.