Lectures are mostly on the white board, interspersed with slides. Lecture slides will be posted here shortly before the lectures. Lecture notes on the white board will be posted after the lectures.
Lecture 1: slides
Lecture 2: slides notes (up to latest lecture)
Lecture 3: slides / see link above in Lecture 2 for latest lecture notes
Lecture 4: slides / see link above in Lecture 2 for latest lecture notes / interactive visualization of strong lensing created by Allan Schweinfurth: https://wwwmpa.mpa-garching.mpg.de/~allansch/lensing.html
Lecture 5: slides / see link above in Lecture 2 for latest lecture notes
Lecture 6: slides / see link above in Lecture 2 for latest lecture notes
Lecture 7: slides / see link above in Lecture 2 for latest lecture notes
Lecture 8: slides / see link above in Lecture 2 for latest lecture notes
Tobias Preis who took the course in WS2022-23 kindly made his lecture notes available here.