Skyrim Walkthrough: Ep. 57 "Forbidden Legend" at Germund's Hall (Gauldur Amulet Fragment) - video Dailymotion
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
Folgunthur - Skyrim Wiki
Folgunthur puzzle - Skyrim - YouTube
SKYRIM] Puzzle Guide - Folgunthur's Symbol Pillars & the Gauldur Amulet - YouTube
Skyrim:Folgunthur - The Unofficial Elder Scrolls Pages (UESP)