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The system store was classified into four categories.

They were physical science, life science, social science, and computing science.

Physical science, as its name suggests, was the study of physical phenomena, covering materials, energy, electromagnetism, gravity, quantum effects, and other fields.

Life science, simply put, was biology. As long as it focused on molecular genetics, the study of the laws of life's activities, nature, development, and the relationship between various living things and the environment it covered, agriculture, improving human life, protecting the environment, and so on.

Social science, on the other hand, uses scientific methods to study various phenomena in human society. It covers a lot of subjects, such as economics, political science, law, and so on. They were all subjects in the field of social science.