A system of Retrieval Practice where items are visited at time intervals to improve retention.
I use a filter system in Notion to simulate a basic spaced repetition system. This is not ideal, as I only get to go as far as a monthly revision with no longer spaces of time. I call this Resurfacing notes.
There is the possibility of using the reminders system of Notion, but I think this would interfere with how I use it as a LifeOS (Life Operating System).