The page description says it all; you just need to Google the words you don't know from the description above. Only modders need to understand the purpose of this mod, but if you really want to understand, you'll need to educate yourself on basics of Lua programming.

https://www.lua.org/pil/1.html

Explain for noobs,please, what is this thing do?

can you add it in the ISToolTipInv:render? self.item currently cant access the fields. I don't know if its possible

ez sub