Free resource
Will Hart 何威 (YouTube)
Unrated口语 Speaking语法 Grammar
My notes
Useful for getting a native English speaker's perspective on learning Chinese — good for troubleshooting specific points that textbooks gloss over.
Will Hart's perspective as a native English speaker who has reached high proficiency in Chinese is useful for troubleshooting the specific obstacles that English speakers hit rather than generic language learning advice. I came back to his content when I was stuck on something that didn't have a clean explanation in the textbooks and wanted to hear how someone with a similar starting point had worked through it. More useful as a diagnostic resource than a primary study method.