I recently started Swedish course on Duolingo and the first mistake I found was in The "Basic skills 1" lesson. The new tasks were added "kvinnan" and "mannen" and there was no explanation for the article "the" in the Swedish language. I hope this problem will be fixed soon. Lover of the Swedish language, Luke Jijer
It is explained in the notes to the sixth (or seventh) skill, aptly named "Definites". For the first few lessons of every new language you just have to accept some things to be explained later. Unless you want a fully theoretical course before doing any practical exercises; that would be reading a grammar book before starting a conversation course. Some prefer that but in general the chosen approach works better.