They should be atomic, that means, if you have more than two sentences for an answer, you probably should split it out into other flashcards.
They shouldn't "hardcode" knowledge, they have to aim to grasp the fundamentals of the topic, so you can think from first principles.
When you are studying a particular concept, mechanism, or topic, there should be cards that approach the topic from different perspectives, for example, you may study the prove of a theorem with cloze overlapper, but you may have another flashcard with a concrete application of that theorem.
Those, I think are the properties that flashcards should have, and may be prompted to the LLM.
The principles of flashcards making, for me, are:
Those, I think are the properties that flashcards should have, and may be prompted to the LLM.