Philosophy. What is The Good Life? Who was Aristotle? Who was Spinoza? Who was David Hume? Who was Rene Descartes?
What is Hedonism? Stoicism? Pragmatism? What is Epistemology?
What is the difference between Subjectivist and Objectivist Ethics? How can each of them be criticized?
Explore what many Philosophers have thought, in the book: Philosophy Made Simple by Richard H. Popkin and Avrum Stroll. It’s a fun read and you can learn alot.