The most common languages of the Feywilds is Elvish & Sylvan. Elvish spoken mostly by the bipedaled fey humanoid races; Eladrin Elf, Darkling Elders & Whatnot - but Sylvan is their primary language.
Travel is nigh-unpredictable, but certain key phrases in Sylvan allow for more expeditious travel to certain areas. As one Bard had discovered, there are a series of musical notes later classified as 'Motes of Emotion' that are able to be used similarly or in combination to grant faster access to different known places in the Feywild. A singular mote can be used to access more generic places like the Glades of Gladness, or the Sorrowful Falls, but speaking -or in this case singing- the notes in certain orders can help you get to more specified places or specific homesteads of various fey. It has also turned into a well-known quest for some bards to try an discover all of the motes of emotion and THEN to unlock the secret of the motes of creation. Fabled songs capable of augmenting the Feywild or even crafting your own Demiplanes on this plane of existence.