No problem. I'm always learning myself, and don't know correct terms for a lot of things. But some here hate that! (laughs) I'm interested in loose change errors, more than the expensive varieties, I just don't have that kind of cash-flow. But I always concentrate on the dies, as in "Could this be caused by a die?" or before the coin is minted. If I think "unlikely" I look for a reason the coin has the traits it does.