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Authors often do very little research to really understand who their potential audience is – or could be.  Asking them: “Who is your audience and who is your competition?” one might receive only vague answers …  However, these are essential questions that are not only very important for self-publishers, but also for authors who want to go with a traditional publisher!  They need to proof to the agent or the publisher that they have done their homework.
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How Can You Research Your Competition?
First of all make a long list with possible keywords that readers might use to find a similar book.
Check out the complete categories / genres at Amazon, Barnes&Noble, Kobo, Apple, Sony, Google Books, Waterstones etc. and study all the books, that could be akin to your future work. Visit several public libraries to learn about your competition. Borrow the most interesting ones…