I travel to Latin America as often as I can manage, so I have been studying Spanish. The approach learned from Duolingo does not train your ear to listen to spoken language well. If you want to actually speak a language with other language speakers, listening comprehension is crucial. I moved to using immersive language learning, listening to Spanish media (mostly on Youtube, but also listening to es localizations of movies/TV). The language basics Duolingo teaches are still useful, and I have a 1100+ day streak, but just doing Duolingo still left me flat-footed on the ground trying to use the language.