I am not sure this is the right place but I could not find a better one.
I have been reading the board info (Arduino - Board) but my question isnt answered.
In a lot of programs I see that the developer chooses pins like 3, 8, 11 or 2, 6, 11, 12 but almost never just 2,3,4,5.
PWM does not seem to be the reason.
So, why not choosing 2,3,4,5 etc? Why jump from 2 to 8 or something?