The rapid development of Internet technology and smart products has provided people with a lot of convenience. Meanwhile, all kinds of notifications and messages mean people's working time has become highly fragmented. The author keenly points out that more than 60% of knowledge workers work time is spent on shallow work. This type of work not only yields limited output value but also permanently reduces people's capacity to work deeply! This book describes how to train the brain to eliminate distractions, improve deep work ability, and create more value.