Hermeneutics is a fancy word theologians use for basic principles of interpretation. This is an important topic for those who are serious about rightly understanding what the inspired authors of the Bible meant to convey. Entire books have been written on the subject, but I thought I would point you towards a very short and helpful overview put together by Bethyada over at True Paradigm. I would further encourage every Christian to invest in a book or two dealing with hermeneutics. There is a lot of confusion out there today, because many Christians have no idea how to properly divide the word of truth.