The Bible is not a monolithic book by a single author. Yes, God is behind the entire thing, but he chose to inspire dozens of authors in dozens of different contexts to communicate his message to the world. So depending on where you are in the Bible, you could be reading any of a number of different genres.
Tommy Keene tackles this issue with much clarity, encouraging us to be sure to identify the genre of any given book or part of the Bible we are reading. Genre has perhaps more influence over what we can expect from a text than anything else.
Genre defines how a certain literary event fits within culturally adjacent literary events. To ask about a work’s “genre” is to ask “how is this work similar to other works, and how does that allow me to better interpret what it is trying to accomplish?” Furthermore, determining discourse type, or literary context, is key to interpreting what you are reading. Imagine you get it wrong. Imagine, for example, that you confuse fiction with non-fiction, or satire with genuine news, or the political stump speech with actual policy, or South Park with a child’s cartoon show. You’re likely in for some interpretive troubles. If you want to interpret any of these things correctly, you need to know how the genre works.
Keene gives a few very simple yet effective strategies for determining the genre of your text. We would do well to heed his counsel.