This is perhaps the least useful tag on the site: learn-chinese. It has no discriminatory power: every single question can have this tag. It's literally what the site is about.
There is learning to cover questions related to the learning process.
Question: Should we blacklist and burninate the [learn-chinese] tag?
We'd need to make sure the questions which only have the tag learn-chinese are retagged first.
The reason meta-tags are a problem is that they do not describe the content of the question.