Vygotsky, a famous psychologist in the Soviet Union, said that this is the best education only when teaching is ahead of development.

1, the famous Soviet psychologist Vygotsky creatively put forward the idea of two development levels of teaching and development. The first level is the existing development level (also known as the existing development zone), and the second level is the recent development level (also known as the recent development zone).

2. Vygotsky emphasized that only teaching is ahead of development can it be a good teaching. From the perspective of teaching promoting students' development, learning first is based on solving problems in existing development areas, and learning later is aimed at solving problems in recent development areas. This is the psychological basis of learning before teaching.

3. Students can solve the problems of existing development zones independently, while the problems of recent development zones can only be solved with the help, guidance, inspiration and guidance of teachers or classmates. From the professional point of view, effective teaching is to transform students' recent development area into existing development area, which is effective teaching. And "learning first" is to solve the problems in the existing development field, and "teaching later" is to solve the problems in the recent development field, that is, teachers and students do their own duties in teaching.