For trail riding with tires containing tubes, 30-35 psi is a good pressure to give you some traction while not risking a pinch flat. If you are running tubeless tires with sealant (probably not), anywhere from 20-30 psi is ok, depending on personal preference.
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It should give pressure on the sidewall.
High! You should hardly be able to squeeze the tire (side to side with your hand) more than a few millimeters.
Depends on the make/model of your tires. Your best bet is to look at the tire sidewall where maximum recommended pressure just about always is listed.