Gary Coon discusses keys to relationship selling, including employing empathy, kindness, and courtesy. He emphasizes treating customers and coworkers well to build strong relationships that lead to repeat business over many years. Specific relationship building techniques include smiling and speaking cheerfully on phone calls, asking about the other person's day, thanking them for their time, and making work fun for both the salesperson and client. The goal is to make the other person feel good about the interaction so they prefer doing business with a salesperson they like.