Your OT remarks are welcome.
I am from the era that software as an "art". I still believe that to be true. For proof it's no longer an art terrible and poorly documented software is today. And need I mention the security vulnerabilities which the copy and paste programs don't see to get or understand.
When software was an "art" didn't the artists have an understand what was going on?
I asked what I thought was a very simple question high level conceptual set of questions which would help me better understand Sketches.
Yes I can do Blink and the 10 or so other intro tutorials. But I'm not more than a monkey folowing instructions. What I'm looking for is a simple understanding of what's going on so I can increase my understanding.
If I have an understanding of what's going on then it will make troubleshooting/debugging much easier.
Not sure why the folks in the post just can't offer a simple explination about sketches.