Introduction to the Five Branches of Philosophy

I've always wanted to understand philosophy more deeply. While looking up a few things on the web, I just stumbled on this neat website introducing the five branches of philosophy:

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Philosophy can be divided into five branches which address the following questions:

Metaphysics	Study of Existence	What's out there?
Epistemology	Study of Knowledge	How do I know about it?
Ethics	Study of Action	What should I do?
Politics	Study of Force	What actions are permissible?
Esthetics	Study of Art	What can life be like?

There is a hierarchical relationship between these branches as can be seen in the Concept Chart. At the root is Metaphysics, the study of existence and the nature of existence. Closely related is Epistemology, the study of knowledge and how we know about reality and existence. Dependent on Epistemology is Ethics, the study of how man should act. Ethics is dependent on Epistemology because it is impossible to make choices without knowledge. A subset of Ethics is Politics: the study of how men should interact in a proper society and what constitutes proper. Esthetics, the study of art and sense of life is slightly separate, but depends on Metaphysics, Epistemology, and Ethics.

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I haven't had a chance to dig around the site much yet, but it looks to be very comprehensive and very good!