1. Basic knowledge and skills: Primary school is a critical period for students to learn basic knowledge and skills, including Chinese, mathematics, English and other subjects. These knowledge and skills are the cornerstone of students' further study and development.

2. Learning methods and habits: Primary education focuses on cultivating students' good learning methods and habits, such as reading, writing, thinking, observing and experimenting. These methods and habits are of great significance to students' lifelong learning and development.

3. Social skills and emotional development: Primary education focuses on cultivating students' social skills and emotional development, including good communication and cooperation with classmates, teachers and parents, and cultivating positive emotional attitudes and values.

4. Physical education and art education: Primary education also pays attention to cultivating students' physical education and art literacy, and cultivates students' physical quality, aesthetic ability and creativity through physical activities and art courses.

5. Moral education and social practice: Primary education focuses on cultivating students' moral quality and concept, and cultivating students' sense of social responsibility and civic awareness through social practice and volunteer activities.

In short, the key content of primary education is to cultivate students' comprehensive quality in an all-round way and lay a solid foundation for their future study and life.