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What is the trick to having plenty of light and not creating a shadow? I'm a newbie at this.
Depends on what you're calling a "shadow." The usual technique is camera square over the coin, with lighting directly above - as close to the lens as possible - and located at 10:00 and 2:00 (roughly) to the coin. Result:

Yes, some areas are a bit darker than others, but it's a pretty fair representation of the coin and those dark areas are just as you'd see it with your own eyes in person.