There are many kinds of economics textbooks in large quantities, including elementary, intermediate and advanced.
As an introductory textbook, I recommend two kinds. One is "Western Economics" by teacher Gao Hongye, which is divided into two volumes: micro part and macro part. The other is "Principles of Economics" by Gregory Mankiw (also divided into microeconomic and macroeconomic volumes). These two kinds of books are now widely used in China, and the language is relatively easy to understand. Paul Samuelson's Economics would also work.
I recommend three intermediate microeconomics textbooks. One is "Microeconomics: Modern Perspectives" by Varian and the other is "Microeconomics Theory: Basic Principles and Extensions" by Nicholson. The mathematical aspects of this book are quite obvious. Domestic textbooks recommend "Eighteen Lectures on Microeconomics" by teacher Ping Xinqiao. For intermediate macroeconomics, I recommend "Macroeconomics" by Mankiw and Dornbush. The former's book is widely used, and the latter's book provides a more comprehensive summary and evaluation of various schools.
For advanced microeconomics, you can study "Microeconomics (Advanced Course)" by Fan Li'an. Many teachers in China also have their own writings. For macroeconomics, I recommend David Romer's "Advanced Macroeconomics".
In addition, there are also "Political Economics" textbooks in China, whose theoretical viewpoints are different from those of Western economics.
For finance, I recommend Mishkin's "Monetary Finance" or Bodie's "Finance" as an introduction. For in-depth study, John Hull's "Options, Futures and Other Derivatives" is very useful. Good teaching material.
In addition, Adam Smith's "The Wealth of Nations" and Keynes's "The General Theory of Employment, Interest and Money" are both good extracurricular readings.
Of course, when you study economics and finance in depth, you will encounter many subdivided fields, such as institutional economics, econometrics, etc. Each field will have its own representative works. I won’t list them all here. And it should be noted that the textbooks listed above are almost hundreds of pages long, and there are certain substitutes for each other. If you are a student majoring in economics or finance, you may wish to study a few more books. If you are a non-major, For students, it is recommended to focus on one book and only do extensive reading on the others to save time and improve efficiency.