In 2022 and 2023 I was in charge of exercise sessions (Übungen) for Вruno Klingler's courses  "Non-abelian Hodge theory, tame and wild" (Summer semester 2022)  and  ''Étale cohomology'' (Winter semester 2022/2023). The problem sheets can be found below. They contain typos and maybe some more serious flaws, so use them at your own risk.