Minicourse on Kac-Moody groups

These are informal lecture notes for a three-hour minicourse on Kac-Moody groups, given at the workshop “Kac-Moody geometry” in July 2023 in Kiel. They provide a concise overview of the book “An introduction to Kac-Moody groups over fields”, EMS Textbooks in Mathematics (2018). They assume a previous familiarity with the (very) basics of Kac-Moody algebras. For readers unfamiliar with the latter topic, short “Prerequisites” notes (referenced within the text) are also freely available.