Dialogue Do's and Don'ts: Crafting Lively and Believable Back-and-Forth on the Pages of Your Book

Writing dialogue should be easy, right?  Most of us talk.  We text, we email, we use words in conversation all the time.  We listen (sometimes) to other people talking.  Dialogue runs through our thoughts all day, every day.  So why isn't dialogue on the page just a matter of listening well and copying down what we hear?
 
Literature has different rules …