>>1536
As this board suggests, "Start with the Greeks". Plato is the logical starting point, granted I'm not too fond of him. I dislike reading quite a bit, well I dislike being forced to read, I guess. Some of his shorter dialogues are great: Hippias Minor, The Apology, Crito are my faves. Don't waste your time reading his magnus opus, "The Republic" if you're like me. (Though the conversation between Socrates and Glaucon is fucking awesome.)
Anyways, there are several other Greek philosophers of course. I highly recommend the Cynics and Stoics, and it appears this board seems to like them a lot too, There are other Greek philosophers, but you can be knowledgeable about philosophy without knowing much about them.
So understand that after that, we have the Medieval Period. Most of them have been "meh" for me. Spend a bit of time on St. Augustine I guess.
If you're a young person I highly recommend Existentialism. Sartre, Camus, Shestov, Dostoevsky, and others are great reads. They really grapple with the questions young people tend to struggle with.
>>1537
This person suggests Aristotle, Kant and Hegel. "Because they were systematic and aimed for a unified philosophy". I don't disagree with him there. But for me all three of those guys are overrated. Yeah spend some time on Aristotle, even though he's a little "dry". You can probably just read summaries and understand him for the most part without torturing yourself. Kant is a guy you should bore yourself with, because his assertions are quite interesting, even if he has a exemplary way of making them quite boring. Hegel I can't say much about, as when I studied philosophy, the woman who lectured in that course was the most confused and nonsensical person I've ever met. But I shouldn't expect anything more from a self-proclaimed Platonist, God bless her.
Nietzsche should also have time dedicated to him. He is kind of an "anti-philosopher", dude really mixes things up.
But in this day in age, most philosophers don't identify themselves as philosophers. Foucault (well he sort of did), Sam Harris, Chomsky, and Peter Singer should all be heard.
I'd really recommend you mix things up by visiting Eastern Philosophy. The Neoplatonism of Plotinus draws interesting parallels in thought from two radically different cultures incapable of communicating with one another.
And as a general guideline; know the differences between Continental and Analytic philosophers. That way when you have a philosophical discussion with one of them you understand where they're coming from.