Subjectivist theory: The subjectivist theory holds that the good resides in consciousness, independent of reality. If the wish or feeling of value exists in the mind, then that constitutes value. Specific versions differ on whose mind is involved. It could be God's, society's (i.e. other people's), or one's own. Both "it is a value because God says so" and "it is a value because my feelings say so" are instances of this theory. The subjectivist theory holds that the value bears no relation to the facts of reality, that it is the product of consciousness, created by feelings, desires, intuitions, or whims. The irreducible primary in this theory is: desire.
Intrincisist theory: The intrinsicist theory holds that the good resides in reality, independent of consciousness. That is "the good" is good in, by, and of itself, regardless of its relationship with anyone or anything else. "Gold is inherently valuable", and "always indent five spaces", and "we must always serve our country", are instances of this theory. The irreducible primary in this theory is: duty, or the "categorical imperative".
Objectivist theory: This theory holds that value is a specific kind of relationship between consciousness and reality. That is, if a living organism is to remain alive, it must pursue certain goals that are determined by facts such as what kind of organism it is, and the nature of its environment. A human being, for example, has specific needs, and a specific kind of consciousness. To remain alive, conscious, and to thrive as a human being requires taking certain actions and avoiding others. That is, the value of an object or action can be objectively determined relative to the human being's goals and the environment it finds itself in. This implies a hierarchy of values and a corecursive process of choices. E.g. a person chooses to get up in the morning and go to work. Work is a value, but in pursuit of a value higher in the hierarchy: to live. The objectivist theory simply means that there are choices leading to subgoals that are objectively consistent or inconsistent with the larger goal. For example, choosing the value of remaining in bed all day is not consistent with the value of keeping one's job. Choosing not to eat or drink is inconsistent with the value of remaining alive, etc.