Some notes arrive on paper without ever passing through students' brains.
You might as well stay in bed and sleep. Other more conscientious students take complete notes on everything in all the lectures and readings. Only material from lectures and readings likely to be covered on graded tests and papers. If your professor prefers essays, your notes should answer your professor's favorite types of questions. Then compile smart notes that will be a comprehensive set of questions and answers likely to be on your professor's tests.