Epistemology is the science about how we gather knowledge
ontology is what you can know epistemology is how you can know it
Epistemology is the study of the nature of knowledge itself. Epistemology can be studied at universities or in books that are devoted to this subject.
Social Epistemology - journal - was created in 1987.
Introduction to Objectivist Epistemology was created in 1979.
Introduction to Objectivist Epistemology has 164 pages.
just briefly, epistemology is the study of knowledge (knowing) and justified beliefs.
Epistemology is the philosophy of the mind. It deals with questions such as "what is knowledge?", "what can we know?", or "how do we learn?".
Ontology is a metaphysical look at our being. Epistemology tries to expose the difference between opinions and proven thoughts. The use of epistemology helps to determine conclusions from ontology.
Existentialist epistemology is, like most existentialism, based on personal choice - i.e. a choice to believe.