IchneumonWasp
Explorer
Then you should check out Ed Greenwood Presents: Elminster's Forgotten Realms.
It was put out a little bit before 5e became a thing and created by Ed Greenwood himself (I think in response to what they did to his world in 4e). Is is 100% fluff, no rules at all. It is filled with exactly the thing you are looking for.
I'd like to second that. It really is a great book. I read into it every time I need inspiration for a game, even a non-FR game. Greenwood really manages to make the day-to-day life in a fantasy world come to life.