https://www.coursera.org/learn/learn-chinese/outline
I hope that it helps
Hello,
I tried it some time ago. The content seems fine to me, although very simple and suitabe for complete beginners only.
It's structure is not very user-friendly, though. Quizzes, for example require you to click on several links and pop ups.
Unfortunately, there is not a higher level free online course taught in the same way.