To learn the basics well, we must be proficient in high school courses such as trigonometry, geometry, algebra, probability, etc., at least we must be proficient in basic theories, and advanced mathematics is to further learn these things. Only by understanding these basic courses can we learn advanced mathematics well.
Cultivating one's logical thinking is very important for learning advanced mathematics, that is, the ability to analyze problems step by step. Usually observe things around you and think more about problems, or cultivate your reasoning ability by watching suspense TV movies.
It is necessary to record more formulas and theories important to advanced mathematics, and prepare a small notebook, including class notes, which can be carried around, memorized skillfully, reviewed frequently and kept in mind. This will greatly facilitate their skilled use in the future.