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True, and here, not always true. The "Classic Nullung" is still allowed. That is the distribution system that only has the phases and N at the house. In the plugs, there are wires that go from the N terminal, to the Ground terminal. It was allowed pre and post WW2 here in Germany, and several...

Yes. Here in Germany for instance, there are several different Distrabution systems. One type gets you all three phases and the N into the house fuse box. You drive a ground rod into the earth to provide ground to your fuse box. This the preferred method. Another system brings all three phases...

In the strictest sense, Ground and Neutral ARE the same.

Load terminals should be snug. No tighter. Chek them once a year. Don't just tighten them, loosen them and re-snug them. As mac wrote, over tightening will result in you buying a new terminal. The terminal is made of a copper alloy. Very easy to strip the threads.