Arduino is neat because you are programming things that interact with the real world. Buttons, lights, sensors, motors. It's extremely rewarding. And it gives a good sense of the underlying technology behind our modern farm machines. After you spend some time with an Arduinoo board doing a project, you'll understand what your tractor computer means when it says a sensor is having a problem and is shorted to the high (or low) source. Arduino does require you to learn some basic electronic principles like ohms law, but the amount of circuitry required to do some pretty advanced things is minimal. It's a forgiving system but if you do make a mistake, well it's a good thing you can buy arduinos for under $20 a pop! I have a drawer full of burned out boards from when I was learning and was trying to interface with some 12V controls (linear actuator). Forgot which side of my breadboard was the 5v side and which was the 12V side. Poof, magic smoke released.
 It's a well-known fact that computers and electronic devices run on magic smoke. We know this because if you ever let the smoke out of something, it will not work any longer.