I Wrote a Book—To Teach the Wolfram Language—Stephen Wolfram Blog

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"I wasn’t sure if I was ever going to write another book. My last book—A New Kind of Science—took me more than a decade of intensely focused work, and is the largest personal project I’ve ever done.
But a little while ago, I realized there was another book I had to write: a book that would introduce people with no knowledge of programming to the Wolfram Language and the kind of computational thinking it allows.
The result is An Elementary Introduction to the Wolfram Language, published today in print, free on the web, etc."

I Wrote a Book—To Teach the Wolfram Language—Stephen Wolfram Blog