Penny.
Please be more specific which coin?
The earliest the coin was produced by the US mint, the more rare it probably is. However, the mint state would also contribute to the coin's value.
The Penny is used the most in the US.
A U.S. coin is a type of currency used in the United States of America.
Be more specific, which coin? Also compare your coin to others - remember the backs of ALL US coins are oriented 180º versus the front.
No. It identifies which mint made the coin. D is for Denver.
It depends. An older gold coin is worth more as a coin if it is in mint condition. That means it looks perfect. It was never used. If it is worn or damaged, it might be worth more for its weight in gold.
They are not legal tender in the US but can be exchanged at a bank for US currency at the present exchange rate.
The metal disc used to make a coin is called a "coin blank" or, more formally, a "planchet." They also used to be called "flans," but that term is no longer as widely used.
A coin from 1824 could be quite rare and worth a lot. It depends on what kind of coin it is. That is, whether it is from the US or another country, and in most cases a bigger coin is worth more. Also, the condition of the coin is very important.
The answer depends on the country or region that you are referring to. For example, the US has a 25 cent coin but not a 20 cent coin. The Eurozone, on the other hand, has a 20 cent coin but not a 25. And since you have not bothered to clarify the region, I cannot provide a more useful answer.
Although the word liberty is on every US coin, no US coin is called a "Liberty" coin. The coin is a 1910 Lincoln cent and depending on how much wear it shows and if it has a "S" Mintmark or not, values run from 25 cents to $75.00 for a coin in circulated condition. Please post new question with more information so a more accurate assessment can be given.