  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.
