When you're learning, what you want to do is study something. Study it hard by focusing intently. Then take a break or at least change your focus to something different for awhile. During this time of seeming relaxation, your brain's diffuse mode has a chance to work away in the background and help you out with your conceptual understanding. Your, your neural mortar in some sense has a chance to dry. If you don't do this, if instead, you learn by cramming, your knowledge base will look more like this, all in a jumble with everything confused, a poor foundation.