I have been learning Mandarin casually for a few years. A while back I went all the way through Duolingo. I picked up some new vocabulary, but it was probably t

I have been learning Mandarin casually for a few years. A while back I went all the way through Duolingo. I picked up some new vocabulary, but it was probably the least effective study method I used. With that said, it was reasonably fun, and I did stick with it for a while due to the gamification, so maybe there's hope for the feature. Just getting people to study a foreign language regularly is probably a good step. I also think that they have implemented some more advanced learning features with a few languages.