The educational environment can be divided into political environment, family environment, school environment, social environment and ecological environment. Science education is three-dimensional and divided into four levels: school education, family education, social education and self-education.
School education: refers to the educational behavior aimed at improving students' IQ.
Family education: refers to the educational behavior aimed at improving students' EQ.
Social education: refers to the educational behavior aimed at improving students' moral quotient (MQ).
Self-education: an individual's educational behavior aimed at improving his comprehensive quality.
The four levels blend, overlap and complement each other, forming a complete education system. Textbooks in a narrow sense are textbooks. Textbook is the core textbook of a course.