A Door Into Hindi - a resource for learning Hindi
I've found an interesting website for learning Hindi:
It contains lessons with recorded dialogues in Hindi so it's a good way to improve listening skills. They actually speak very fast so it may be a bit difficult to understand at first but each lesson has a script, which is helpful when one doesn't understand a certain word or a certain part. There is also vocabulary and grammar notes for each lesson. I started to use this website last week and I like it very much. I think it's good to try after completing the Duolingo tree.