Difficult experiences during the learning of a language

I think that the most difficult part about learning a language it is the pronunciation speech and learning more words, phrases, or inclusive cultural differences(or nuances)things when you want to travel to another place. But while during the learning, you can meet new people who can help you. Some tTime(or a long time) ago, I read an article that said that the sSpanish language is the most difficult language to learn because it hashave many grammatical rules..., but step by step, you can learn anything.everything