Training activities aimed at improving students' knowledge and skills, or improving students' mentality and forming certain habits. For example, piano training courses, such as eloquence training courses, such as 5S training courses, such as president training courses. In the modern era of fierce economic competition, high-skilled and high-quality talents have competitive advantages, and corresponding training institutions have emerged. Simply put, it is to improve your knowledge after class, increase your knowledge and make it easier for you to learn in class.