Besides telephone sales and sales in traditional industries, what other sales models are there? How exactly does it work?

I am a senior salesman. There are three sales methods: direct selling, marketing and pyramid selling.

The telemarketing you mentioned is not a model, but a way, or a means of sales.

For example, direct selling includes two means: calling to make an appointment to meet, and then visiting at home.

Marketing is: call to make an appointment for the course and the meeting place, and then explain the publicity at the meeting.

Let's not talk about MLM.

As for how to do it well, there is a lot to say. I suggest reading more relevant books and teacher videos, which will be more clear and useful than what I am saying now. Another word for you, to do a good job in sales, you must be bold, cautious and thick-skinned.