It helped me a lot ever since I started using Duolingo. It helped me on Chinese a lot.
I agree with you because after using Duolingo, my Chinese became better and better. I can have a conversation in Chinese with other people, and I wouldn't feel uncomfortable talking to others in Chinese. I think Duolingo is a great place for people that need help on different languages or wanting to learn different languages.
Tbh i prefer Duolingo to the more traditional versions of learning Chinese (I mean through books and school)
I think it would be a great idea for Duolingo to have a book for learners to go on a pratice. Also, I actually wish that Duolingo can let Chinese learners to choose if they want to learn Simplified Chinese or Traditional Chinese.