What are the differences between the Modal, Accusative, and Dative cases in German?

I am currently in German III, taking German IV next year, and I keep forgetting what the differences are between these cases.





Thank You.What are the differences between the Modal, Accusative, and Dative cases in German?
The accusative case is used for the object of a sentence.


';The cat wears a hat'; (a hat would be in the accusative because the hat is being worn.)





The dative is used for the indirect object.


';He gave her a present';


';her'; would be in the dative because he gave the present to her.





I don't think modal is a case.


Modal verbs are words like: want to (wollen) should (sollen) etc