Which dialects does this chinese course teach? Mandarin? And which writing system does it use? Traditional or simplified? I plan to learn the chinese language one day but not now because I am learning a different language now and I plan to be fluent in it first before moving to another language.
Oh, and other than duolingo. Where would you suggest to learn Chinese?
The course teaches Mandarin which is based on the Beijing dialect; it uses pinyin and simplified Chinese. I personally find HelloChinese, Drops, and LingoDeer to be really good. All should be free and are on phone, so you can do it on the go anytime. Drops is a vocabulary building app, so it won't teach you grammar of any sort, but the others will! Lingodeer gives really good grammar explanations, same with Hellochinese.
Hope this helps!
Edit: Accidentally said Shanghai instead of Beijing, my mistake.
Duo's course uses simplified ones since they are most fundamental in teaching Chinese.
As a Taiwanese-American, I write and read traditional Chinese characters. However, I am also capable of reading some simplified Chinese characters.
Some people suggest that apps, like HelloChinese and LingoDeer. However, since some of the apps may not teach or emphasize multiple translations of the same sentence, it's more often powerful to apply the language here and also with natives online.