Zhang Yu's "Thirty Basic Lectures" is a very popular set of mathematics teaching materials for postgraduate entrance examination, which covers basic knowledge such as advanced mathematics, linear algebra, probability theory and mathematical statistics. It is suitable for reviewing Math I and Math II for postgraduate entrance examination. This set of teaching materials is characterized by simple explanation and rich examples, which is suitable for students at all levels, and can benefit both students with good mathematical foundation and students who take exams and graduate studies across disciplines. Zhang Yu's basic 30 is suitable for No.1 and No.2, but in practical use, it needs to be chosen according to its own actual situation and learning needs. For example, if you have a good foundation in mathematics, you can review it directly with Zhang Yu's 36 lectures; If the math foundation is poor, then Zhang Yu's 30 lectures are more appropriate. Brief introduction of Zhang Yu: Zhang Yu: Ph.D., a well-known national expert in mathematics counseling for postgraduate entrance examination, and "the backbone teacher of national excellent curriculum construction" by the Ministry of Education. The best-selling books in China are Zhang Yu's Lecture on Advanced Mathematics 18, Zhang Yu's Lecture on Linear Algebra 9, Zhang Yu's Lecture on Probability Theory and Mathematical Statistics 9, Zhang Yu's Classic on the Source of Mathematics for Postgraduate Entrance Examination 1000, Zhang Yu's Complete Solution to the True Questions for Postgraduate Entrance Examination, and Zhang Yu's Lecture on Mathematical Basis for Postgraduate Entrance Examination 30. Analysis of Mathematics Examination Syllabus of National Unified Entrance Examination for Postgraduates, invited expert of Slovenian Global Sustainable Development Conference in 2007 (delivered 15-minute keynote speech), chief lecturer of famous postgraduate mathematics tutorial classes in Beijing, Shanghai, Guangzhou and Xi.