Our knowledge of reality that we amass and construct from various philosophical perspectives and the value we attach to them, forms the base of all our understanding.
Ontology deals with what is there to 'know' about the reality and epistemology which deals with all the 'ways of knowing' the knowledge through means of perception, intuition, reason or faith.
Ontology and epistemology gives rise to philosophical perspectives (system of generalized views of the world, which form beliefs that guide action) which deal with methodology (strategy), methods (technique) and sources of knowledge.
Axiology deals with value of a given knowledge i.e. Ethics (actions) and aesthetics (beauty).