A SRS, or "Spaced Repetition System" is a method of learning things. Think of a set of flash cards -- you review them every x days. The more you get it right, the more time between reviews of that card, until you 100% know it.
The reviews allow you to retain information for a lot longer.
[[Anki]] is a SRS.
## Resources
https://tatsumoto-ren.github.io/blog/spaced-repetition.html
#japanese