Essentially, goodness is anything that has positive value and evil is anything that has negative value. Other words for good include “right” and “pious” and other words for evil include “wrong” and “bad”. If a state of affairs leads to higher overall value, then one can say it “should” or “ought” be that way because these words can both be paraphrased, in most contexts, as “It would be better if…” or “It would lead to higher overall value if…”