The courses that universities must study vary from school to school, but in many countries and regions, the following five courses can be considered as necessary: natural science, social science, mathematics, cultural studies and foreign languages.

1. natural science: natural science courses mainly include research in the fields of physics, chemistry, biology and earth science. Natural science courses help students to study and understand natural phenomena, and support students' ability to explore scientific methods and think about scientific problems.

2. Social science: Social science courses involve the study of politics, economics, sociology, psychology and anthropology. Students learn about human behavior and social system through social science courses, and develop the skills of researching and analyzing problems.

3. Mathematics: Mathematics courses involve algebra, geometry, calculus and statistics. Mathematics is a basic tool in various scientific research fields, which can help students improve their logical thinking ability and problem-solving ability.

4. Cultural studies: Cultural studies courses help students understand and explore the influence of culture and analyze and explain cultural phenomena. Cultural studies can involve literature, history, art and music.

5. Foreign languages: In the globalized world, foreign language courses are very valuable. Students can choose to learn one or more languages and learn grammar, phonetics, vocabulary and pragmatics.

These courses can serve as the basis of university education. They can help students improve their comprehensive quality and knowledge level, broaden their thinking horizons, strengthen their understanding and exploration of the world, and also support their future career development and personal growth.