A deck is a named collection of flashcards. Decks are how you organize what you're studying: one deck per topic, one per language pair, or however else you want to split things up. "French Idioms" and "Business English" could be two separate decks in the same account.
Every card belongs to exactly one deck, as covered in Welcome to flangu. A card can't exist without a deck, and it can't belong to more than one deck at a time. If you want the same word available in two different contexts, you need two separate cards, one in each deck.
The Decks tab
Decks in the bottom navigation bar is where you see and manage all your decks. Each deck appears as its own entry in the list, showing its name and how many cards it holds.
Tap a deck to open it and see its cards. Tap the plus button in the top-right corner of the tab to create a new one.
Deck settings
Each deck carries its own settings: a review mode, a retention target, and daily card limits. These apply to every card in the deck and are covered in later articles in this section.
Statistics and reviews
The Decks tab also reflects how each deck is doing and whether it has cards ready for review. Deck-level statistics and starting a review session from a deck are both covered elsewhere in the documentation.