Knowledge

One of Socrates' main theses was that virtue is knowledge.  Knowledge, specifically self-knowledge, is how a person goes about living a good life.  Being knowledgeable, a person would always choose good, as ignorance is the only evil.  But how do you learn to be knowledgeable? How is that taught?

The two main ways of learning are probably school and just life itself.  However, during that time the Sophists had sort of corrupted education, twisting it into a profession where they instilled virtue while holding that virtue was relative and teaching how to win at arguments (or 'win' at life) through tricky, circular logic.  Socrates, though, stayed a good teacher, keeping and sharing his beliefs all the way up to his execution.  So in the right way, maybe you can be taught to be knowledgeable (and by extension, good).  However, Socrates is famous for his 'Socratic Method' where conclusions are drawn from being asked question after question, which is, essentially learning the answer from within yourself and your own life experiences.