After looking at the various leveling guides that provide in-game addons, I determined Zygor's was the sauce.
Calaméo - Zygor guides are the best add-on for WOW lovers
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ZYGOR: WoW's Best Addon? (My Review)
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GitHub - Hydra9268/ZGESO: A public domain ESO Leveling Guide originally produced by Zygor Guides
Zygor Guides - Blog