"Influence -- The Psychology of Persuasion" by Robert Cialdini is excellent background reading. Any reasonable bookshop has 100s of books on sales. Best to browse and pick one that resonates with you.
The best way to start learning is to watch and listen to a good salesperson doing their bit. For example, visit a prestige car dealership after you have read "Influence" and see how they apply the various aspects. Ideally get a job as a junior salesperson working for a great salesperson. Your learning will go much better under expert guidance. You just can't learn enough just be reading books, watching videos.
From your question you appear to have conflated marketing, public relations, negotiating, etc as being sales. They are all distinct functional areas that support sales, but are not "selling" as such.
The best way to start learning is to watch and listen to a good salesperson doing their bit. For example, visit a prestige car dealership after you have read "Influence" and see how they apply the various aspects. Ideally get a job as a junior salesperson working for a great salesperson. Your learning will go much better under expert guidance. You just can't learn enough just be reading books, watching videos.
From your question you appear to have conflated marketing, public relations, negotiating, etc as being sales. They are all distinct functional areas that support sales, but are not "selling" as such.