Though I wouldn't recommend you buying On Writing and Worldbuilding if you're not already into Timothy Hickson's essays on YouTube—there are much better writing books out there—or Avatar: The Last Airbender—which, as a fact, I am not—or his humor—it doesn't always work on paper—, it's alright. Not at all a Bible or something you must read by any means, but it does the trick for the most part.