The Choice Between Good and Evil

This week is studying the difference between good and evil, and the choices they present. To me, the choice between doing good and evil is not always clear, but it is usually. Despite that, I tend to do things either reflexively or instantaneously, and I don't always consider the options I have on how to react. So I sometimes make evil choices, especially when angry or hurt, as that is when my brain goes into overload and I want to hit something, generally the person who hurt me or I am angry at.

How do we know what is good and what is evil? I don't know how we first learned it, other than Adam and Eve both ate from the tree or the knowledge of good and evil and since then we have been punished for the wrong things we do. I know what I consider evil, such as vengeance, hatred, and stuff like that, but I don't know everything God considers evil. In fact, I don't think anyone does. Just another question to add to the post-bucket question list.