Multiple quests requirements here.
Go to Bahar near the stable to get "Watch Out, Santo Manzi", do the next quest too and it will bring u to Santo Manzi.
At in-game time 20:00-24:00 he will give you the quest "Why Did the Goblins Run Away?" if you have 10 amity with him.
Finish that quest then he will give you the quest "Things She Likes". The knowledge your looking for should be within this quest line.