The difficulty lies in three aspects, but the most difficult place lies in the third aspect, that is, the low fault tolerance rate caused by full competition. If you want me to assign him, 50% of the difficulty is in the third aspect, 40% in the second aspect, and 10% in the first aspect.

On the one hand, it mainly means that things are huge and need a lot of time and energy. The operation itself is simple, but it needs mechanical repetition.

In the second aspect, the structure of things is very complicated, with many changes and rich levels. People change as much as they change, and it is almost impossible to have a deep understanding without certain experience and experience. If you don't understand the essence, you can't walk out of the superficial changes. The second aspect of futures is indeed a bit difficult, but a person with sound intelligence and independent thinking will eventually solve this problem after a long period of hard experience and exploration.

The third aspect is the low fault tolerance rate caused by full competition. The survival rate is low, only a few mistakes are allowed in the growth process, and a large number of unqualified individuals will be eliminated in repeated competition.