When I began to read the book I expected it would be similar, in terms of number of pages, to 21 lessons for the 21st century which is written by Yuval Noah Harari. However, even though the book is too short, its content is very precious. Humanity can take a lesson from history, especially in the technological era, because we all easily access myriad of information. That's why, the author premises his arguments on the historical incidents, while he considers today's issues.
There is twenty lesson, or suggestion which is different from one another. First of all, do not obey in advance. If citizens blindly adhere to government and their politics, it can have enormous control on you. Secondly, to defend institutions, because they can not protect themselves without support from public. Thirdly, beware the one-party state, as long as politicians do not face with opposite view or act, they can readily constitute dictatorship over citizens like that is done in twentieth century by fascists, communist and Nazis.
I just mention about three of them, but I highy recommend that you should read a whole book.