Where can one get the extensive knowledge needed for gold smelting and assaying?

Like the disclaimer for Bering Sea Gold says. Are there some courses, one can take in university, or books to read and/or YouTube videos, to learn the basics of business ventures. Also are there any safe gold smelting jobs where one can live comfortably, as a gold assayer/smelter?
Also in the early part what can I do in a farming town to contribute online until I save some money to move off gold panning in the wilderness.

I would like to see how much it would cost for a beginner with a high school diploma to get involved in the gold rush.