Help me, who can tell me the central idea of the Four Great Classics?

The Four Great Classics referred to the four classical Chinese novels, Dream of the Red Chamber, Journey to the West, Water Margins, and Romance of the Three Kingdoms. These four works were all classics, which contained many profound thoughts and philosophy. The theme of Dream of the Red Chamber was "The Tragedy of Jia Baoyu and Lin Daiyu's Love", which showed the conflict between family ethics and love values in traditional Chinese society. Through the love story of Jia Baoyu and Lin Daiyu, the novel explored the profound philosophical issues of human nature, love, marriage, and so on, showing the various drawbacks of China's feudal society. The theme of Journey to the West was the story of Sun Wukong wreaking havoc in the Heavenly Palace. It showed the Chinese people's love for myths and legends and their desire for freedom. Through the stories of the main characters such as Sun Wukong, the novel explored philosophical issues such as human nature, morality, and justice, as well as the essence of Chinese mythology and traditional culture. The theme of Water Margins was "The Story of the Righteous Uprising in Liangshanbo", which showed the resistance of the people against oppression and exploitation in traditional Chinese society. Through the story of the righteous men in Liangshanpo, the novel explored the philosophical issues of human nature, morality, righteousness and emotion, as well as the heroic image and heroism in Chinese cultural tradition. The theme of Romance of the Three Kingdoms was "the historical stories of the Three Kingdoms period", which showed the Chinese people's worship of history and heroes and their exploration of war and power. Through the historical stories of the Three Kingdoms period, the novel explored philosophical issues such as human nature, power, loyalty, betrayal, and the history and historical figures in Chinese cultural traditions. Each of the four masterpieces contained a lot of profound thoughts and philosophy. They were classics and had made important contributions to the research and development of Chinese culture and society.