Ali Abdaal's tutorial about using the app Notion for studying and organization. It discusses the use of the Cornell Note Taking Method and active recall to better understand and retain information. The video also mentions the importance of testing oneself and using spaced repetition to counteract the forgetting curve. The creator suggests using a retrospective revision timetable in Notion to track and space out the repetition of studied material, using a rating system (out of five) to guide decisions on what to study next and when. The video recommends the book "Make it Stick" as a resource on the science of effective learning, and mentions the use of emojis as a rating system in Notion.