Dale Carnegie's How to Win Friends and Influence People was first published in 1937 and became an instant bestseller, selling over 15 million copies. The book teaches fundamental skills for dealing with people, such as seeing situations from others' perspectives and making them feel important, in order to influence them without manipulation. Carnegie believed financial success depends more on interpersonal skills like leadership and enthusiasm than professional knowledge alone. The timeless principles in the book help readers make people like them, change minds persuasively, and handle people tactfully to avoid resentment.