How to learn Ash? – Ash Questions / Help

Hi, guys
I’m newbie to Ash. I started to look Ash since yesterday, but I’m wondering from where I should to start to learn.
Should I read all document on this Home — ash v3.0.0-rc.45 ?
Or should I wait the book from Progprag?
Any advice will be helpful!

I would definitely start with the release candidate documentation, yes We will be publishing more documentation soon, and the 3.0 release candidate will happen any day now as well.