Become genuinely interested in other people, smile, and give honest appreciation to encourage others to talk about themselves without criticizing, condemning, or complaining. Listen to others and make them feel heard by focusing on their experiences rather than criticizing or complaining.

1. Don’t criticize, condemn or complain. Become genuinely interested in other people
& Smile. Give honest and sincere appreciation. Be a good listener. Encourage others
to talk about themselves.
http://girishg.net/art-of-listening/