This is how I read books about World War II... In addition to basic history textbooks, I read Patton, De Gaulle, Churchill, Stalin, Zhukov, Roosevelt, Eisenhower, Hitler and Rommel. Biography... I feel that after reading these, I can basically understand the background of the entire World War II, and even the content of World War I... If you are interested, just read more about modern European history... I recommend you to read Patton, The biographies of Roosevelt and Churchill are quite interesting and cover a wide range of content