Michael Nielsen, http://augmentingcognition.com/ltm.html

An online book by Andy Matuschak and Michael Nielsen.

Initially I was stirred to this idea from this writing by Michael Nielsen
http://augmentingcognition.com/ltm.html

Plenty of other readings from Piotr Wozniak, Andy Matuschak, Michael Nielsen, and others in the Supermemo, Anki, and other communities.