Org-fc is a Spaced repetition system for Emacs’ org-mode.
It allows you to mark headlines in a file as “flashcards”, turning pieces of knowledge you want to learn into a question-answer test.
These cards are reviewed at regular interval. After each review, the next review interval is calculated based on how well you remembered the contents of the card.
Bibliography
Leon. 2022. “Org Flashcards.” https://github.com/l3kn/org-fc.