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How to Win Friends and Influence People by Dale Carnegie is one of the most influential self-help books ever written, with over 15 million copies sold since its original publication in 1936. This classic guide offers timeless advice on how to improve communication, build meaningful relationships, and positively influence others—whether in personal life, business, or leadership. Carnegie’s practical principles, including techniques for handling people, winning others over, and changing behavior without arousing resentment, have helped generations succeed socially and professionally. Ranked number 19 on Time Magazine’s list of the 100 most influential books, it remains a must-read for anyone striving to grow their interpersonal skills and leave a lasting impact.