In view of the hot issues of public concern during the COVID-19 epidemic, questions and answers will be provided on how to travel, how to protect their homes, how to disinfect and other hot issues that are closely related to people's lives during the epidemic. The characteristics of the novel coronavirus are introduced and the simple and feasible suggestions are given for different places and different groups to protect themselves.In addition, the important design operations in the book are matched with the corresponding video, for the convenience of readers to reference and imitate.