The Frankfurt School's Book of Critical Theory introduces the thought of philosophers Max Horkheimer and Theodor W. Adorno in two points of thought. First, the concept of critical theory. Second, a critique of rational human efforts that appear to be stalled and failed. In this new edition, Sindhunata adds an article on the theory of the Frankfurt School which is used to highlight some of the social symptoms of the present. Rationality that turns into irrationality, and enlightenment that overturns into a myth that many of us find in reality. The author explains how based on the critical theories of Horkheimer and Adorno, we can see and criticize the symptoms of post-modernism & post-truth, populism, identity politics, and religious radicalization, which have emerged recently. The book, which continues to be used as a handbook for the teaching of philosophy and social sciences, contributes critical thinking to academic and intellectual circles. By studying critical theory, we will continue to be sued, so as not to be lazy to think, to continue to be willing to hone our minds, to achieve a better world than today's world.