my rendition of a trading guide

saw someone did this but I don't remember where, this is my rendition of it.

you have the trades on the left of the villager.

blue shelf is for the items they are buying in exchange for emeralds.

oak shelves are for the stuff they are selling. 6 slots is usually enough but you can add more shelves, I just did 6 because I just want to see the most important trades. the one I saw just had a shelf(3 slots) above the villager for a more compact design

for book trades you can also put them in shelves if you have a resource pack differentiating the books, but I jist did the ole' reliable sign above the villager.