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I think this is a dumb question, but I learn a lot from dumb questions: does it matter whether a vent is above or below a fixture? If so, why? Thanks.

Obviously there are details to figure out, but am I on the right track? Thanks!

Why is it not okay to have a urinal empty into a waste stack vent? Is it because of the amount of water they discharge? Thanks.

Is there ever a reason, apart from cost or it just being unnecessary, to not place a vent somewhere in a drain (assuming the vent is angled correctly)? I mean, is it possible to cause problems by "over venting"? I don't see how it would be, but I don't know plenty of things about this. Thanks!

Is a fixture always said to be dry vented if there is a dry vent sufficiently close to the trap? I mean, sometimes a fixture is close enough to a soil stack that the stack might provide some secondary venting. Am I right in thinking that that possible secondary venting is irrelevant?

Is a horizontal offset in a soil stack always prohibited? If so, why? Thanks.

First off, thanks to everyone who might help. I appreciate it. I had a single story home with a bath on the main floor and in the basement. I've built an addition onto the side of the house that is two stories (the ground floor being a garage, above it a master bedroom with bath). I'm...