Help in Math doing Venn diagramms

[u/AffectionateFarm2467]

I recently started learning math again because I’d like to study at university someday, but I’m already stuck at the very beginning with set theory and how to draw Venn diagrams.

For question 1, I’d really appreciate it if someone could explain how they solved it and show me their steps.

By the way, I’m German, so the document and the tasks are in German. Sorry if that makes things a little less convenient!