You can talk about how environmentally they are in germany (different trash cans and common use of bicycles), the Autobahn and U-Bahn (metro) system, and the different holidays they celebrate to name a few differences
Dem
I’m born and raised in Germany.
Dir Frau geht in den Supermarkt. Nominativ
Die Frau kauft in dem Supermarkt
Dative
Ich will alles schon gut machen
Genitive
Je suis allé chez Flunch avec 5 personnes.
J'ai mangé des pizzas hier soir chez Peri.