Best-selling author Beth Reeks writes about what she knows, and she knows plenty about being a teenager. The British 17-year-old captured the universe of crushes, cliques and first kisses in her book “The Kissing Booth,” which secured her a three-book deal from Random House. Reeks, whose pen name is Beth Reekles, wrote the book when she was only 15 and was frustrated with the reading choices available for kids her age.