Skyrim:Forbidden Legend - The Unofficial Elder Scrolls Pages (UESP)
Skyrim Folgunthur Pillar Puzzle - YouTube
Forbidden Legend - The Elder Scrolls V: Skyrim Wiki Guide - IGN
This is the only canon puzzle (Dragonborn DLC - Kolbjorn Barrow) that's so obscure that I doubt the vast majority of players have solved without Google : r/skyrim