haskell - two of the three outgoing tutorial tips go 404

This is the paragraph containing the bad links, the first and the last one don't exist anymore.

"You can find a much gentler introduction from the excellent [Learn you a Haskell](http://learnyouahaskell.com/) (or [up-to-date community version](https://learnyouahaskell.github.io/)), [Happy Learn Haskell Tutorial](http://www.happylearnhaskelltutorial.com/) or [Real World Haskell](http://book.realworldhaskell.org/)."

Also I didn't understand the paragraph about fixing precedence and the $ operator at all.