If the child is 3-4 years old, zero-based thinking can choose to practice from the bud. The five-year zero foundation can start from the exploration chapter, and if you feel tired, you can also start from the germination chapter. The knowledge points in the embryonic stage are relatively simple. The content is biased towards basic ability training and cognitive exercises. In the process of practice, deepening can help children lay a solid foundation for learning and improve their thinking ability in a subtle way.