Philosophy is about how we think about the world and all the stuff within it in general. Ethics, ontology, and epistemology are all parts of philosophy.
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In this category you can post rather theoretical ideas and thoughts that are rather general and don’t fit into the other more specific categories.
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If you want to post about values, what the world actually is (or might be), how to acquire knowledge about the world (via science or rationality or something), or how to best think about these matter, then this is the best category to go to.