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Those are really good questions. And I don't see good answers to them
I didn't like the book. The book's more like reference material, not a textbook. You can't really learn anything from it if the topic is new to...
Main camera the Transform component, put Z to -10. You probably reset it from the start.
Same here. Can't see un the play mode any object created. And this is a completely new project, couldn't have messed up anything even if I wanted to.