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I would also recommend the documentation. However, if you're really looking for a good book, Agile Web Development With Rails is great. I would hold off on getting it until the new one comes out, which will include all the new features of Rails 5. You shouldn't have a difficult time with it since you do have prior experience with different technologies.

Another resource would be GoRails. Some of the videos require a membership though.

All the best!

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