As writers, there are all sorts of things that we need to know, either to add detail to a story or because of the work/interests of our characters. For example, if your MC works in a coffee shop, they will be expected to know and talk about coffee. The same goes for farmers, bakers, astrologers etc… So here’s a few charts and graphs that might help you with your research.
Just click on the image to go to the website where there will be more information, if you want it.
(Above images from Mcgooen on DeviantArt)