Standardized training and so on. The national vocational skills training textbook is formulated according to national standards and vocational standards, which ensures the standardization of training content and teaching methods, helps to improve the training quality, ensures that the skills and knowledge acquired by students meet the national requirements, and provides knowledge and skills. Textbooks provide a comprehensive knowledge and skill system, and provide students with necessary theoretical knowledge and practical skills. Through textbooks, students learn relevant theoretical knowledge and practical skills to help them master the required vocational skills.