This course will explore a central question from several angles: how should your beliefs change when you learn something? If you have no background in formal epistemology, this course will serve as a hands-on introduction to helpful formal tools, as well as a survey of some of the most intriguing open questions in the field. For instance: there are compelling reasons to think that you do not learn a proposition when you learn that if John went to the party, then Mary did also. But this raises interesting questions, such as how to update on non-propositional information, and whether such information can constitute knowledge. Other topics will include updating de se beliefs and updating imprecise credences. Requirements include weekly readings, some problem sets, and a term paper.