The language??? Its so easy to learn compared to other languages. Norwegian and swedish are pretty good and icelandic is a lot stranger but youre gonna recognise a lot of stuff from old and middle english. Its kinda like shakespear but nordic. Then theres danish and finnish… those are horrible. Danish is incredibly hard because of its fucked up phonetics(it literally has sounds no other known language has) and finnish has extremely hard grammar and the words are different. Im saying this as a native hungarian speaker(finnish and hungarian are related tho you cant understand one from another the ways in which the languages are hard are still somehow the same) dont learn finnish even tho its a bit easier than hungarian. But norwegian and swedish are pretty easy, can recommend.