The most important concepts of epistemology?

[LastSimon]

What's up!

Before I start with psychedelics I definitely want to have a solid understanding of epistemology. Which concepts do you hold as most important to develop such a solid understanding of epistemology?

Until now I understand the concept of default position, paradigms and the quines-model quite good, but I think that's definitely not enough. 

 

Best regards from Germany