Traditionally, philosophy includes at least four core fields or disciplines:

1. ontology

2. epistemology

3. ethics

4. logic
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1. Ontology - study of beings or their being — what is

2. Epistemology - study of knowledge — how we know

3. Logic - study of valid reasoning - how to reason

4. Ethics -study of right and wrong — how we should act

5. Phenomenology - study of our experience — how we experience

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⁃ Socrates and Plato put ethics first

⁃ Aristotle put metaphysics or ontology first

⁃ Descartes put epistemology first

⁃ Russell put logic first

⁃ Husserl (in his later transcendental phase) put phenomenology first