Sun Tzu's Art of War was an important military classic in ancient China. Its main military ideas included the following aspects: 1. Identification of friend or foe: Sun Tzu's Art of War emphasized the need to accurately identify the enemy and avoid confusion in order to better formulate strategies and tactics. 2. Plan before you act: Sun Tzu's Art of War believes that before formulating strategies and tactics, it is necessary to study and plan sufficiently so that you can take action quickly in the war. 3. Speed in war: Sun Tzu's Art of War emphasized that in war, one must act as quickly as possible to win. 4. Defeating the many with the few: Sun Tzu's Art of War believes that victory can be achieved by defeating the many with the few by surprise. 5. Concentration of forces: Sun Tzu's Art of War emphasized that in war, we should concentrate our forces as much as possible to give full play to our military advantage. 6. Pay attention to morale: Sun Tzu's Art of War believes that morale is one of the keys to victory in war. We should pay attention to boosting morale and maintaining the combat effectiveness of the army. 7. Be good at using the environment: Sun Tzu's Art of War emphasized that one should be good at using the environment in war, such as using the terrain to hide within the enemy's territory. These thoughts were still of great value to the study and guidance of modern military warfare.