Flashcard Review
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Cards you answer correctly get scheduled for review after progressively longer intervals (like 1 day, then 3 days, then a week), while cards you get wrong reset to a short interval — this concentrates your time on material you haven't yet mastered.

Reviewing material right before you'd naturally forget it strengthens memory more efficiently than either reviewing too soon (wasted repetition on something already known) or too late (you've already forgotten it and have to relearn from scratch).

A common recommendation is 10-20 new cards per day for sustainable learning, since each new card adds to your growing review workload — introducing too many at once can create a backlog of reviews that becomes overwhelming.

It usually indicates the card is either poorly designed (testing too much at once, ambiguous, or relying on rote memorization without understanding) or covers a genuinely difficult concept that needs to be broken into smaller, more focused cards.

Not necessarily — retention depends more on consistent daily review and correct spacing intervals than on cramming a large number of cards in one sitting, which increases fatigue and reduces the quality of each individual review.