I have learned a lot of German from this app and I do find it very helpful. My one complaint is that sometimes it will just give you a wood and guts and you have to guess its meaning and it doesnt really teach you the words first, it just starts throwing words at you. I find the app Tiny Cards® to be a great help also and a very nice sister app to Duolingo®. Overall, pretty great app!
Puppy lover38 about Duolingo Learn Many Languages for Free, v5.0.15