It doesn’t make sense, but it jibes with my experience. Tutorials and blog posts about OpenGL are super heavy on C++, because gaming.
The official docs are C, of course, because the API is C. But the docs are rather abstruse for a beginner, and really become useful only well after you’ve gotten your bearings. (e.g. my personal beef: function names tend to be two nouns with no verb to say what the thing actually does, so you look in the docs and it says it “binds” noun A and noun B, with no explanation of what “binds” means in context, which direction the data binding goes, whether it persists, etc.)