According to the author, our current habits can, in a way, predict our future. For instance, good financial habits could be instrumental in achieving a pleasant retirement. Likewise, good fitness and nutrition habits are essential for our future health. The author highlights the importance of small habits projected over time. The book provides tips to try to acquire good new habits and get rid of bad ones. #1 New York Times bestseller, 15 million copies sold around the world, and number one in Argentinean charts nowadays.