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One of the best places to get a good foundational education in mint errors and varieties is the American Numismatic Association's error coin and minting process correspondence course.The course was put together by Dr.James Wiles, and offers a broad overview of the minting process and errors and varieties.

The course is easy, but it packed with high quality content at the same time, making for an excellent educational opportunity for the aspiring error collector. I highly recommend you take it, since it is absolutely necessary to understand the minting process if you want to understand errors and varieties, and also you will get a good basic understanding of all the major error coin and variety types. Even if you feel fairly knowledgeable about error coins and the minting process, this course will give you a broad and fairly deep understanding of the whole subject.

You do need to be an ANA member, but that isn't a problem since all coin collectors should belong to the ANA. It's the biggest coin club in the world, and is the best resource out there in terms of offering educational opportunities and camaraderie with fellow collectors. here is where you can take the correspondence course: https://www.money.org/diploma-program

The error coin course is listed as:  The Modern Minting Process and Errors & Varieties correspondence courses: $39.95

There are also a number of other high quality courses offered by the ANA, and we highly recommend you take whichever seem applicable to you!