How does the Flashcards study mode work?

In Flashcards mode, you review cards one at a time. Tap a card to flip it and reveal the answer, then rate yourself as "Know It" or "Still Learning." Cards you mark as "Still Learning" are re-queued for further review in the same session. Spaced repetition optimises which cards are shown and when. You can also undo your last rating, toggle between front-first or back-first orientation, and enable auto-play text-to-speech.