Free resource
Mandarin Click (YouTube)
Unrated语法 Grammar词汇 Vocab
My notes
Structured explanations of grammar and vocabulary points. Good supplementary resource alongside the HSK books.
Mandarin Click's structured explanations are good for reviewing grammar and vocabulary points after initial exposure rather than as a primary introduction. I used it as a follow-up to HSK book content when something wasn't consolidated after the first pass — the format is clear and the examples are practical. Think of it as a reliable reference you can pull up when the textbook explanation isn't quite clicking.