From the perspective of behavioral finance, “Investor’s Friend” deeply analyzes the deep psychological reasons that investors fall into these investment misunderstandings, and points out more scientific investment methods for investors: grasp the rhythm of transactions, diversify allocation, and choose stocks calmly. When choosing calmly, stop the loss in time… I hope this book will become a true friend of investors, helping investors accumulate their wealth in market fluctuations and realize the preservation and appreciation of their wealth.