One wire is live, the other wire leads back to the breaker and carries extra live current back to the box - for a simple view.
If you put the switch on the nuetral wire, all the wires up to it are actually live all the time, including through the light fixture. That can be kinda exciting changing a bulb if you touch the socket....
If you put the awitch on the live wire, then when it is off, very little of the wires are 'live', only the one up to the switch.
Upside down or not wouldn't be a concern, it is whichever wire is hooked to it.
Switches have 2 different colored clamps, and you want to get the right wire onto the right clamp.
Any more, switches get hooked up with ground, and multiple lights, multiple switches, power feeding off to another switch or outlet, so there may be many more actual wires in any one switch box....
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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