Trust. It is the true foundation of any strong, long-lasting relationship, isn't it? And the importance of trust is no more evident than when it comes to sales. Because If a customer gets even the slightest whiff that you are not totally trustworthy, you can say “sayonara” to your sale. Regardless of what you are selling, if they do not trust you, they will not buy from you. Learn the basics of building a great rapport with your customers.