From what I understand, Goodness is an attribute of being as desirable or lovable. In our ordinary experience, what is real is not always so desirable. Not to mention, we also have a tendency to develop ideas of goodness that are not always recognized as desirable. Usually in the form of rules. Natural Law on the other hand, which as far as I know is the primordial understanding of good and evil, due to this natural desire for the ultimate good, and the inherited natural ability to recognize the value of existence.
You’re raising the question of metaethics. Moral realists believe there are objectively right (and wrong) ways to behave. Moral anti-realists do not. If you’re interested in delving into the subject, you may enjoy this paper as a starting point.