Use case
Books and courses
The goal is not summarizing every page; it is preserving ideas you will need to retrieve later.
When it helps
Dense chapters, long classes, cumulative concepts, and review before seminars or assessments.
How to use it
Create cards by concept, keep minimal context, track coverage, and consolidate before expanding to the next block.
Honest limit
Content that never becomes a card does not enter metrics. Missing coverage is not zero performance.