Be respectful of the other person's dignity. Don't try to make yourself look good at someone else's expense. Don't minimize others' accomplishments and abilities. Give credit where credit is due. Don't boast of your own achievements.
Deeds always speak louder than words.
Give others a chance to stand in the spotlight. Be magnanimous in victory and gracious in defeat. Don't use flattery to ingratiate yourself with others. Respect others as individuals and expect respect in return. Don't try to impress others with your intelligence.