I used to be a sales engineer for a while, telling us how to use ERP, and then each department manager came in to talk about some projects and products that their department was responsible for, and then you didn't know how to allocate them to the departments you didn't want to do, and then asked your superiors to give you a price when quoting, without knowing how it was worked out or telling you how it was worked out. With good colleagues, old colleagues will teach you enthusiastically, but they are all very busy.
To put it bluntly, sales depend on your understanding and talent, and on how your superiors lead. If he is willing to teach you some useful common sense and skills, you really have to burn incense to thank him.