A good textbook for a course should cover all the necessary topics in a clear and comprehensive manner. It should also have relevant examples and practice problems to help students understand the material better.
You can ask your professor or classmates for recommendations, read online reviews, or visit your school's library to browse through available textbooks.
This ultimately depends on your personal preference and budget. Used textbooks may be more affordable, but they may also have outdated information. New textbooks may be more expensive, but they will have the most up-to-date information.
Some features to consider when choosing a textbook for a course include the level of difficulty, the format (e-book or physical book), and any supplementary materials such as online resources or study guides.
You can preview the textbook by reading a few chapters or checking out sample pages online. You can also ask for recommendations from students who have taken the course before and have a similar learning style as you.