Life is sales. Though you may think you've never been in the position where you had to sell a product, I'm willing to bet you've had the opportunity to convince someone to do something. Sales is simply the art of persuasion. Practicing the art of both written and verbal persuasion in everyday interaction will help you improve your sales "skills."
For a non-conventional--yet extremely practical--approach to sales, I'd recommend Sell or Be Sold by Grant Cardone.
For a non-conventional--yet extremely practical--approach to sales, I'd recommend Sell or Be Sold by Grant Cardone.