There can be many reasons why a book fails to grab readers, and while this blog concentrates mostly on the technical aspects and marketing side of self-publishing rather than the actual writing process, the choice of book genre can have major implications on both writing and marketing.

Writers often start writing a novel without giving their end product much thought, so when finished, it may sometimes be difficult to find a precise category or book genre for the book when it comes time to publish.

So here is a useful guide which explains with absolute clarity what the major genres represent, and what readers expect from each genre:

Via https://www.justpublishingadvice.com/do-you-know-your-book-genre/