Whenever I see see "many errors" I become skeptical as it is hard enough to find a single error, let alone many.
@Katalina, if you are interested in learning, suggest two things, learn how coins are minted. An error can only occur during the striking f the coin so by knowing the minting process, and how coins are produced, you can eliminate many of these "errors" as damage. Remember, there are many more ways a coin can be damaged than there are ways to create an error. Next would be to go on a website such as errors-ref.com. This will give you some insite as to what an actual error looks like. There are also other references there that can help.