The document provides a guide by Yulian Amstislavski on overcoming selfishness, emphasizing the connection between selflessness and happiness through scientific studies. It includes practical short-term and long-term strategies for improving selflessness and fostering generosity, such as analyzing selfish behaviors, empathy exercises, and maintaining relationships. The author promotes a mindset of continuous personal growth and emotional fulfillment through selfless actions, supported by personal anecdotes and evidence of the benefits of altruism.