Best Nordic/Scandinavian Language to Learn

Hello! I am new around here and I want to know which Scandinavia Language(s) is/are best to learn. I am Turkish but I know English very well.

-Swedish -Norwegian -Finnish -Danish -Icelandic -Greenlandic -Faroese

I love rare and unknown languages (such as some languages in Greenland or Faroese itself.), also where can I learn them? Thanks!