Philosophy is the first question that must be asked. It will shape all your other beliefs. So lets start simple with Natural Philosophy.
The goal of philosophy is to become Wise. To do that one doesn’t need to find answers, that’s not what it’s about, you need to get perspective. So next we need to cut the simple confidence of Natural Philosophy. We do that with two concepts: Reality Tunnels and Syadasti.
Those are both taken from Discordianism, so may as well head there next. It’s a religion, which isn’t for everyone (especially if you’ve already got one you want to stick with), but it has useful concepts nonetheless.
From here the linear thread breaks down. It’s best to decide what it is you wish to learn more about and go to that page now, the groundwork has been laid.