189 - Deliberate Memorization of Information - is one of they key parts of learning. This becomes important when you aren’t dealing with ideas with such frequency that they naturally get memorized. So you have to create an artificial exposure by deliberately attempting to retrieve the memories. This is what we mean by studying and rote memorization.
Often it is done through the use of flashcards or a Spaced Repetition program such as Anki and SuperMemo.