I'm learning English. I think correct pronunciation is what I find very difficult. I am only concerned about pronunciation because there many words that have similar sound.

Listening when native speakers speak quickly and also expressing myself whenever I lack vocabulary

I think the obstacle which faces every body in his way is how to make a good conversation

@barkit2 well maybe this is not a problem when learning a new lenguage, this could be a problem in any lenguage even in native language. From my point of view, this is not a problem if you learn with a teacher because he/she always is going to have a topic to develope.

And for the original question, I think difficulties are different depending on the learning stage you are.

@barkit2 that’s true!