First off, not everyone knows about Khan Academy.

Secondly, the link is unspecific because the OP hasn't detailed exactly what areas he needs a refresher in. It might be Algebra, it might be Calculus. Better to send him to a general higher level than to one that might be irrelevant to him.

Thirdly, it's obvious that he's not suggesting to follow the entire Academy's course load. If the question had been, where can I get a copy of "Atlas Shrugged" and I had said "Barnes and Noble", that wouldn't be me suggesting he should buy every book in the store.

The irony here is that it's your post that is "all noise and adds no value". Which is, I imagine, along with your tone, why you got so many downvotes.

Your post is all noise too. Just use the downvote button when you see a bad comment -- don't make another bad one ten times as long.