Am beginning to realize how important it is to learn the gender of nouns. If you don't know them, then using the different correct form when using the different cases is not so simple.
In one of my other courses came across “der Kaarte”, but Lena and Paul talk about “die Kaarte”. When I asked for a clarification was told it would be explained in a later lesson as the “der Kaarte” was in the dative form in the sentence. At beginners level and was told it would be explained later. I wait with baited breath for that lesson. Better crack on then