1, natural sciences (such as biology, chemistry, physics, etc. ).

2. Study individual and social sciences (such as economics, psychology and sociology).

3. Learn formal science of abstract concepts (such as logic, mathematics and computer science).

Precautions:

Science is an ordered knowledge system based on testable explanation and prediction of the form and organization of objective things, and it is systematic and formulaic knowledge. Its object is objective phenomenon, its content is formal scientific theory, and its form is language, including natural language and mathematical language.

Science is based on research, usually in academic or research institutions and government agencies and companies. Scientific research affects the scientific policies of enterprises and countries by developing commercial products, armaments, health products and environmental protection.