is it very dificult?
High Valyrian is really cool, I would definitely recommend it, although it is rather different to English so that might be a problem.
Welcome to Duolingo! I hope you will enjoy your time here. I have done only a few lessons in High Valyrian and yes, I found them to be very hard. The words are long and sound funny. But if you want to, go ahead and learn High Valyrian. Again, welcome to Duolingo! Best wishes in your language studies!
Also, have a lingot for trying my favourite language (fictional language) :)
its not a real language. it was made by David Peterson for the Game of Thrones tv series. so it is spoken in the tv series and by fans that learned the language for fun