It is as difficult as climbing a mountain. Big vision only came out in recent years. The broad vision of elite mathematics, the new methods of cultivating excellent students, and the exploration and application of new ideas were all written by a man named Huang Dongpo. There are not many repetitive topics with big vision and new methods, but more new methods and new ideas. Basically, each section has one or two repetitions. The repetitive topics of big vision and new methods should be difficult problems.