The form of moral realism I prefer is that the word ‘morality’ just means something like utilitarianism, and therefore for moral knowledge you need to be able to figure out which things can have preferences/welfare, assess what their preferences/welfare are, and somehow aggregate them. I think there are also plausible versions where a moral system is something like a set of social norms that ensure that everyone gets along together, in which case you need to be in a society of rough equals, figure out which norms promote cooperation or defer to someone else who has figured it out, and be able to apply those norms to various situations.
The form of moral realism I prefer is that the word ‘morality’ just means something like utilitarianism, and therefore for moral knowledge you need to be able to figure out which things can have preferences/welfare, assess what their preferences/welfare are, and somehow aggregate them. I think there are also plausible versions where a moral system is something like a set of social norms that ensure that everyone gets along together, in which case you need to be in a society of rough equals, figure out which norms promote cooperation or defer to someone else who has figured it out, and be able to apply those norms to various situations.