inside of the ring. The centripetal force (felt as the artificial force "centrifugal") pushes one away from the center. Thus to grow food it has to be in the innermost section of the ring.
Unless you want to hydroponic it and walk on the windows. Or perhaps slightly less freaky; pathways between windows.
? Don't understand that at all.
It could be anywhere on the ring. It... erm... well, going by your terminology it "pushes one away from the centre" (although more accurately technically it pushes the surface 'below' the item up towards the item sitting on it) but you get
more force the further out you are. Which I don't read into what you said there.
For hydroponics, you could perhaps put it at the outer part of rim (more gravity, assuming the plants can stand up whatever increase that is, but you can do all kinds of things to mitigate that, but a part of the station you might not want to having living quarters) or in the inner part of the rim (for less gravity, which the plants would be happy enough with I'm sure, and again you might not want to
live there, lest you get some of the trouble with bones/muscles that the spinning station was supposed to resolve). But you could probably work in either environment. And access it from the side, top, below, whatever works...
In fact, I'm sure we could work with plants (non-GMed ones, even) that can be grown nicely in a zero G environment, so even up at the hub (if not
all over the station) , or on a separate 'farm station' that isn't spinning for the sake of humans because they're not living there 24/7/52.17, etc.
Certain algaes in water suspension, perhaps. Although you might have the same problem with gas/nutrint diffusion in the liquid as with trying to maintain a
flame in zero G (but 'normal' enough atmosphere). But some recirculation method could probably work.