Some coin collecting questions.

I'm probably am going to be asking a lot of questions on here, hopefully not dumb ones .
Also what is a details grade?

 

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On the 1964 D i am aware that it doesn't have any value, im just asking so i get a better idea of what different grades look like.
On this coin I still would like to know if there is a way to get the gunk off. I save older copper cents that I get in pocket change. Also I would like to know incase I find a more valuable coin that has something on it.

 

is that the American numismatic association? I tried typing just ANA into YouTube and it brought up a bunch of stuff that definitely was not about coins.

 

In G-4, if it's copper-nickel (should weigh at least 5 grams if it is), a problem-free example bids at $18, so my buy/sell margin would likely be $7/10, although I'd knock the sell price down to $9 if a customer bought multiple coins, and $8 if it sat for a while.

 

Most graders look at the Obverses of the coin first, and it's the Obv that carries most of the weight in the grade