I think there are a lot of us out there crying for help. I just purchased the Arduino Uno R3. Got it used. No documentation at all. Arduino site is extensive; I could read it for weeks and not find the answer to my questions. As a former engineer with GE Ordnance Systems, I am not totally ignorant when it comes to electronics, electro-mechanics,etc. So Vasquo recommended being specific so, here goes.
Question #1: Other than the pins used for interfacing with shields, I count 12 pins that are a mystery. 6 marked ICSP near the ON led and 6 unmarked pins near the pin 13 blinker led. What are they for specifically? In setting up the Arduino for use, do I need to do anything with these pins, jumperswise?
Question #2: I have read in a least three places where when updating the software in the Arduino, one must thoroughly remove any previous version of the software (ie grbl).Nowhere, however, have I seen any instruction on how to do that.
There will be more questions as I