Larry,
thank you for your answer.
I do not understand it at all but mostly I load file sketch and then change a few things, I often learn well from this, I also understand that when I see it happening. little by little I understand.
When I read this code, I think it says when the first LED starts and how many LEDs are present. is that right? Y++ counts up. I often try it in a schematic and by trying and changing, I quickly find out what it does exactly.
It is quite difficult to create your own LED scheme, for example 2 white 2 red and 2 blue running and if he has done 4 times everything in orange changed as an example. Therefore, working with 00ff00 code seems easier than this but it is good to learn how things can be done differently.