I have never heard of a website specifically designed to help people learn about authenticating autos, but there are plenty of resources out there that can one can use to further someone's education.
Certainly sites like Net54 can be of help giving opinions. PSA exemplars site as well as net searches can yield may good exemplars that can be used to study a specific autograph.
As a general starting point, I would say a few things
1) due your own due diligence. Start by being a skeptic and demand the auto be proven real rather than the other way. Use common sense to answer the simple questions first, like could the item have been signed.
2) Develop a network of people whose opinion you trust to help you.
3) Just look at a lot of autos of the person you want to buy. There is really no "trick" to it.
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