Free resource
Zhangkai Chinese (YouTube)
Unrated听力 Listening语法 Grammar
My notes
Clear, well-paced explanations suited to intermediate learners working through the upper HSK levels.
The explanations on this channel are well-paced for intermediate learners working through upper HSK content — not so slow it feels patronising, not so fast that you're pausing to catch up. I found it useful for grammar points that the textbooks stated correctly but didn't fully demonstrate across different sentence contexts. Consistent quality makes it a reliable supplementary reference.