How to think correctly?

[AbsoluteBeginner]

OK, my ANN RGB->HSL program QWVK484.000

I thought that you would propose a PROBLEM, to solve which you need to create a new program. I would then demonstrate exactly the PROCESS OF PROGRAM DEVELOPMENT using a diagram.
But, if you want, I can create a diagram of a ready-made program to compare in what form it is more convenient to study the logic of the program.