question) where can i use this item

hi. i am a newbie to this game.

this game is not detailed enough in explanation.

played the game for 5 days but still struggling to find out what is what and which is which.

could become much more pleasant if the explanation is more detailed and clear.(i.e. item names are not directly related with purpose... at least in my language, korean. and atill cannot find the language change option damn it)

at least i want to know what i am spending my money on. and it is you game company's obligation. don't you agree?