the basic structure of reality

Metaphysics is the branch of Philosophy Index  that examines the basic structure of reality.
It is often characterized as first philosophy, implying that it is more fundamental than other forms of philosophical inquiry. Metaphysics is traditionally seen as the study of mind-independent features of the world, but some modern theorists understand it as an inquiry into the conceptual schemes that underlie human thought and experience.

Categories

Ontology Index

Morality

Sources

Metaphysics - Wikipedia
https://en.wikipedia.org/wiki/Philosophy