How do you pronounce those?
Well, I’m not an expert but I was thinking about how I’d explain it to a foreigner if they happened to ask it. No-one has ever asked it so I kinda have to force feed my great ideas to you.
Ä, is like a in the word “cat" and Ö is like i in the word “bird”
I think different accents ruin this anyway but it’s still somewhat a guideline.