The basic (biological) definition of "good" and "bad" for an individual: does the creature feel pleasure, benefit, comfort or unpleasantness, pain, discomfort?
If you feel unhappy in life, something is constantly missing, you don't fit in with your surroundings, you feel discomfort, you know that something is wrong,
While traveling (mentally) to various non-physical worlds, you can encounter various beings. Here is a guide "from non-physical life" that may prove useful.
