There are a lot of good Arduino books out there. Most teach you how to install the editing environment, how to code, and neat projects like blinking a LED, reading a light sensor, or controlling a motor.
Only one teaches you about motion, the science behind it, and how to make your Arduino interact with the real world through electro-mechanical, pneumatic, and hydraulic ways. Learn how to size motors for a particular task, how to determine rpm and torque requirements, and much more.
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I believe this is the most important Arduino book available, and it has a prized position at my work bench. I recommend it highly!