This is the first self-improvement book I have ever read and it is also probably one of the oldest in this category. Written in 1937, mainly for the door to door salesman of that era, this book by Carnegie can truly be called a classic. It shows what we all intuitively know: it doesn’t matter what your line of work is or what you want to achieve- if you are doing business of any kind, you need to make it about the other person. Being nice helps, a lot . And while I might not fully defend the premise of this book, because it doesn’t distinguish between genuine interest and faking it to get what you want, it still contains a treasure chest full of timeless wisdom. Everybody wants to feel appreciated, and rightfully so. Learning to take a small effort to make someone’s day will make the world run smoother, no matter what your goal is. I still spontaneously remember some of his guidance, and perhaps this quality is the reason why this book still draws millions of readers to this day.