I read a LOT of books on writing. From basic craft issues to revising to promoting and while I may not use every suggestion, I do take a little from this book, a bit from this other book and some from that one over there and a smidge from this one here. I then add it all together and get what works for me. And that's what you should do too.
One of the books I've read lately is Get Known Before the Book Deal by Christina Katz. I really like this book. It discusses how to use your personal strengths to grow an author platform. And it's actually something that we can start thinking about now so I highly recommend the book if you are serious about a career as a writer.