This book serves as an important learning aid for "Selected Works of Marxist-Leninist Classics (Reading Book for Party Members and Cadres)" (hereinafter referred to as "Selected Works"). The purpose is to help the majority of party members and cadres better understand the basic content of "Selected Works". According to the order of the articles listed in "Selected Collection", the book introduces the writing background, writing purpose and writing process of each work one by one; outlines the basic content and main points of the work; and explains the theoretical value and practical significance of the work. This book is of great significance for the majority of party members and cadres to systematically study the scientific system of Marxism, deeply understand and master the positions, viewpoints and methods that run through it, establish a correct world outlook, outlook on life and values, establish a correct outlook on power, status and interests, and further enhance their ability and level to promote scientific development.