Alec Greven's book began life as a creative writing project in school at Castle Rock, Colorado.
His handwritten pamphlet was then sold for $5 at a school book fair where it was the surprise bestseller.
Local news outlets took up the story, Alec was then invited on to a TV talkshow which led to him sealing a publishing deal with HarperCollins.
And his book is now available as a 46-page hardcover version across the US.
"I saw a lot of boys that had trouble talking to girls," Alec told the New York Post's Jennifer Fermino. "If I say hi and you say hi back, we're probably off to a good start," he said.
His advice to boys includes - stop showing off, go easy on the compliments and be wary of "pretty girls".
"It is easy to spot pretty girls because they have big earrings, fancy dresses and all the jewellery," he writes in chapter three. "Pretty girls are like cars that need a lot of oil."
And he continues: "The best choice for most boys is a regular girl. Remember, some pretty girls are coldhearted when it comes to boys. Don't let them get to you."
Alec's mother, Erin Greven, says her son's insight is down to his avid reading: "He reads non-stop. At dinner, I say, 'Put your book down,' " she said. (roundup)