Tell me about your experiences and gains when you first started working in sales?

I am working in marketing and running the market. I have learned a lot. When I first started, I was unwilling to leave. I was very determined, even though I had to run outside in the 38-degree high temperature in the summer, and even though I had to work hard when dealing with customers. Judging from the look on the guard's face, even though he worked overtime until 9.10pm every day, he didn't care, he just wanted to learn knowledge.