Chapter 3 of the book “论语” talks about the importance of learning. It says that if you want to be a good person, you need to learn from those who are wise and knowledgeable. You should also be humble and willing to learn from others, even if they are younger than you. The chapter also emphasizes the importance of practicing what you have learned and not just memorizing it. In summary, this chapter teaches us that learning is important, and we should always be willing to learn from others and put our knowledge into practice.