The main theory of teaching goal classification is the theory of educational goal classification. The theory of educational goal classification refers to the classification of educational goals according to different standards, so that educators can make educational plans and teaching programs, so as to better realize educational goals.

The theory of educational goal classification mainly includes the following aspects:

1. Cognitive goal: Cognitive goal refers to the development of students' knowledge, skills and thinking. This goal usually includes the improvement of students' knowledge level, skill level and thinking ability.

2. Emotional goal: Emotional goal refers to the development of students' emotions, attitudes and values. This goal usually includes the improvement of students' emotional experience, attitude and values.

3. Behavior goal: Behavior goal refers to the development of students' behavior. This goal usually includes the improvement of students' behavior norms, habits and skills.

4. Social goals: Social goals refer to students' development in social responsibility, civic awareness and social participation. This goal usually includes the improvement of students' sense of social responsibility, civic awareness and social participation ability.

The main function of educational goal classification theory is to help educators make better educational plans and teaching programs, so as to better realize educational goals. At the same time, the theory of educational goal classification can also help students better understand their learning goals, so as to better plan their learning plans and learning directions.