I'm a newbie to Arduino so please excuse the easy question and guide me to the appropriate sources or forums. I just bought an Arduino Uno Starter Kit that comes with the "Arduino Projects Book" by Scott Fitzgerald et al and I'm happily working my way through the projects. I downloaded the Arduino IDE (version 1.7.10) onto my mac and am turning on lights, etc. However, I'd like to see the underlying code. For example, I use the code "digitalWrite" to turn off/on LEDs. I'd like to see the code for this. I can imagine that it's just a write of 1 or 0 to a particular memory address, but I'd still like to see it. I was hoping there was a right-click->"Go To Definition", but I don't see it. I downloaded the Arduino IDE to my Downloads folder and run it just from there. It's called Arduino.app. I don't see a folder with .c and .h files as suggested in this post: Arduino IDE, Underlying Code and Libraries Maybe I'm missing them?
Also, is it possible to set a breakpoint?
Again, sorry if these are "obvious" questions. And I did look at the Arduino site without any success.