Goal of this thread is sharing and talking about resources for good formulation.
I’ll start with the following list. Feel free to add your own.
- https://controlaltbackspace.org
- https://andymatuschak.org
- https://augmentingcognition.com
- https://eshapard.github.io
- https://cademcniven.com
- https://supermemo.guru
- https://1perfectionist.livejournal.com/
- https://incrementally-do.blogspot.com/
- https://wiki.issarice.com/wiki/Category:Spaced_repetition (suggested by xalbo)