How do you pronounce a Danish ø, æ, and å?
It depends on whether they are long or short, whether an R is close to them (immediately before or after), and so on.
Try starting at https://www.youtube.com/watch?v=lRlofK-SsOY and following the "related videos" links to other vowels.
This might help you out: https://www.duolingo.com/comment/4287094
Danish vowels tend to be challenging. Have patience.