Raspberry Pi Press Books [Free]
I just saw this from the other forum: https://magpi.raspberrypi.org/books
Not sure how long the free downloads last, so grab them before they disappear. I find the terminal/command line book very readable; it is perfectly pitched for Linux newbies (ok I get it that it is Debian oriented because Raspbian is based off Debian but they can always learn other distros later).
The Scratch book is helpful if you have kids that you want to introduce programming to.
The other stuff may be of interest if you intend to play around with a Raspberry Pi.
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