Let's talk about training. W. seems to be distinguishing training from learning or understanding. Am I reading this correctly? I admit confusion when W. directs us to the example in  & says, "we may perhaps get an inkling how much this general notion of meaning of a word surrounds the working of language with a a haze that makes clear vision impossible." Does he mean that out usual way of thinking about language is so infected by the Augustine word-thing view of language that we cannot think clearly about what is really going on? That reading of  would make sense to me.
Christopher Robinson & Joseph Duemer read Wittgenstein's Philosophical Investigations