For me the challenges of language learning is my mind set. I had italki classes more than 100 classes so far but my English skill improve a little bit especially speaking skill because I'm a lazy student I don't like homework Iand I'm a thoughtful person example If I have to speak or communicate with other in english I always worried about the sentences that I speak out are polite or not? Is it weirded ? or sound strange so the easy way for me just avoid to speak english with strangers and practice english only on classes.