[lrei]

Research shows that doing the recall is the important part. The effect is by now well accepted. Off course if you do the cards yourself you can guarantee both their quality and their relevance to you. Ive heard of research pointing that learning things that are relevant to you helps. (If you are learning Spanish to speak with a relative or friend a flash card with an obscure literary word is probably more annoying than helpful). early episodes of Learning Scientists podcast talk about using vs creating flash cards if you want to know more.