PCGS has a ton of great videos on YouTube and this series, Coin Grading 103, Ungradeable Coins has in addition 4 videos of counterfeit coin detection, copper, nickel-silver, dollars-commeratives, and gold coins. Might save you a few buck on buying fake coins... Who loves you, baby? https://youtube.com/playlist?list=PLG7e8_oGOkcB3XYPRae0o1WiV9u-qLhQ3
These days anyone buying raw coins would be wise to spend time learning to detect counterfeits. It's a sad reality that there are more entering the market all the time. I wonder how many new collectors will be willing to go that extra mile to become smart buyers. Thanks for the link.