What do you think is difficult about learning English? I would think slang and expressions are very difficult to understand. Most movies are full of it!
My dream is to understand American dramas and movies
without dubbing someday.
So a mountain of idioms and slang things are tough to me.
And some minute "nuance" thing, too...
My English teacher often corrects me saying " You can use it, but we don't usually say so... It sounds a little bit strange to me."
I feel this linguistic sense towering in front of me like a wall.