Eh. I am not super versed in it but I know a bit. Mostly due to Total War Shogun, some anime(Fate, and samurai anime, granted they are greatly skewed but still) and some research for making japanese samurai characters. Oh and I know a bit about spiritual Japan such as Yokai and their Dragons
This is more early modern Japan, if you ever watched Rurounin Kenshin or played the Fall of the Samurai expansion of Shogun 2 then you'll have a pretty good idea