Decks are composed of words that you want to remember. More specifically, any word or sentence that you star in a text will automatically add itself to a deck. You can use decks to store words that you want to remember, and more important, use as a word list for your quizzes. FullChinese decks hold an average of around thirty words. While it is appropriate to flag more than thirty words per text, we found that it is best to learn no more than thirty entries at a time.