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In my experience here are the ways in which you can learn sales and be a top-notch professional.
Observe what good salespersons in your organization do – If you are working in a sales organization, this is absolutely important and fastest way to learn. I have observed many strong sales persons (and not all were in sales!) and many interesting styles to sell. Observe very closely how the best sales persons in your organization bring in sales, how do they fix their appointments, how do they ask questions, pitch and handle objections from clients. How do they position themselves and so on.