Primary education. Primary education is the most critical stage of children's growth and the basic stage of cultivating children's comprehensive quality. At this stage, children need to learn not only knowledge, but also how to cooperate with others, how to express their thoughts and feelings, and how to establish correct values and outlook on life. Therefore, primary education is the most external, because it is not only related to children's personal development, but also related to the future development of the whole society.