During the interview, the leader asked me about my views and understanding of the sales industry. What should I say?

The more honest answer is: answer whatever you think and say whatever you think.

The relatively empty answer is: for example, the sales industry has great potential, I like sales very much, the development prospect is great, it is very training, and it is also a test for myself. Anyway, I have worked in sales, which is really difficult to do. It is not difficult for a difficult person to do it. Sales depend on taking the initiative, you have to sit and wait for business, then you starve yourself to death. Secondly, you have a thick skin. If you can't stand grievances and hardships, don't do sales.