To win friends, key principles include becoming genuinely interested in other people, smiling, remembering and using people's names, being a good listener, talking in terms of the other person's interests, and making others feel important sincerely. Avoid criticizing, condemning, or complaining; instead give honest appreciation and arouse in others an eager want. Winning people over involves avoiding arguments, respecting others' opinions, admitting when wrong, beginning conversations in a friendly way, and seeing things from the other person's point of view. Making others happy about doing what you suggest and encouraging good traits in them also helps build friendships.