Pls any unique strategy that will improve sales In the business industry?

First all of you understand customer need what his need select the product or anything you want sale to him or do the rcpa on his shop by the help of his attendant when you get some information about customer than you have more chance to sale the product to customer because you get basic information about customer like behaviour, likes, need etc

Your product knowledge and relation with a client in manner to sell yourself first to attain his or her's believe on you.