In this book Dale Carnegie is trying to open our eyes to such a wonderfull way to make our lives better in business , spiritual, mental.. he shows many ways divided by 4 parts which chapter is full of informative key to open the right path , which the most effective and popular in my perspective are: never critics anyone and in case in necessary situation start by showing your mistake with the respectfull way because the way of telling has a great impact , deal with people by talking on thier passion let the talk to be more about them , respect people not order them, show appreciation, avoid arguments, admit your mistakes, let the other say yes yes to your contents,remember names ,smile with others,be good listner,be positive, encourage people for improvement.