Tethered, as I use it means that the camera is attached (tethered) to a computer so the images pop up on the computer screen as I shoot them. Having a much larger image helps me see what I am getting much better than the little window on the back of the camera. Especially when you are looking for glare on copy prints. I also use this when I do portraits so the subjects can see what we are getting as we do the session.
Keystoning is the effect you get when you shoot something like say an 8x10 photo at an angle so that two of the the sides are not equal in length and the other two sides are no longer parallel to each other.
Hope that helps.
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