Duolingo quality varies a lot based on which specific language you're doing. Some features (e.g. stories) aren't available in all languages. It's possible this

Duolingo quality varies a lot based on which specific language you're doing. Some features (e.g. stories) aren't available in all languages. It's possible this is just the language I'm learning, but the "duolingo learning what you need to learn" seems iffy in my experience. It frequently prioritizes three words for me: "spring", "autumn" and "bag". It's unclear why, but every time I do an "review of old material" practice there are those three lessons. There's a lot of material which I make actual mistakes on that it could prioritize, but it never does. It used to be you could get a the whole list of words (and duo's rating of your progress) but they killed the endpoint with the redesign. (Probably reasonable, the main use case for it was to dump the course into something like Anki... certainly that's what I was going to do with it). I definitely made a fair amount of progress using Duo, but never got beyond the "struggle to communicate in any meaningful way" stage. Fluent Forever (a competing app) got me a lot farther (but is expensive and requires a fair amount of invested effort), and some basic flashcards got me much closer to reading comprehension than grinding Duo lessons. All in all I can't tell if this is a marketing speak that is only loosely connected to reality or if duolingo just has inconsistently rolled out features.