What do moral philosophy and the science of morality study?

And where does most of that information, to work with, come from?
You think it can be self-generated?
But you were born from your mother, and probably raised by parents, culture gets poured into you before you can even think clearly. Heck, while your brain is still all sponge, soaking in everything around it.

So God did?
That gets us nowhere.
Who is God, but a creation of your, our, own imaginations?
What are these “universal” truths?
Where (how) are these truths to be found?