Source: Getting Started with Arduino, 3rd Edition by Massimo Banzi and Michael Shiloh (2015)
Example:
There are many versions of this board; the one we’ll use throughout this book is the Arduino Uno, which is the simplest one to use and the best one for learning on.
to learn on, I would reckon, typically means to continue learning something, but from the context of this passage and the fact that it has only been a few pages of the book since I started reading it, it doesn't really sound like what they mean is that the Arduino microcontroller board is the best one for continuing your learning process.