Before buying this I went through the free pdf sample he released. It was really nice and even though I rarely use game engines or do shader work the theory in it was very nice.
Essential math for game devs by the same author is also great
This is the free sample I was talking about
Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20243401/28/24/ENG-VE-VOL2-FREE-SAMPLE.pdf