Key dates, and semi-key dates are those coins that are difficult to find. Collecting a type of coin can be possible only if you can get these hard to find dates.
Coin errors come in a variety of types, some common and some not. Coins can be far off center, double die, double date, over-struck dates or mint marks, and many more. Rarely one might find a penny on a quarter blank, or similar errors.
Counterfeit coins can sometimes be easy to spot, but too often are extremely difficult. Although technically not counterfeit, altered coins where mint marks are added or removed, or dates changed are also of concern.
So, books devoted to such topics have been written.
Coin Supplies
Check the link above for coin books.
Strike It Rich with Pocket Change: Error Coins Bring Big Money
2013 US Error Coins - Coin Values Based on Realized Auctions (Volume 10)
The Official Guide to Coin Grading and Counterfeit Detection, 2nd Edition
Detecting Counterfeit and Altered U.S. Coins (ANA correspondence course)
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