What is the theoretical branch of philosophy?

Theoretical philosophy directs itself in knowing things as they are without thinking of the application of it.

Its branches of theoretical philosophy are as follows:

1. Metaphysics - philosophical field which deals with the fundamental nature of reality, being and existence.

2. Cosmology - deals with the study of physical world/universe as a rational and orderly system.

3. Epistemology - study of origins, presuppositions, nature, extent and veracity of knowledge

4. Psychology - study of nature and functions of the soul, mind or spirit

5. Theodicy - philosophical field which studies, nature, being, goodness and justice of God, God-Man relations and other doctrines related to divinity