You will better remember the information if you try to retrieve it from memory that is answer a question or rewrite a definition, rather than for example reread it the source material (even though it will feel other way round)

Hence if you read a piece of text through twenty times, you will not learn it by heart so easily as if you read it ten times while attempting to recite it from time to time and consulting the text when your memory fails. – Francis Bacon, 1620