There’s coding and there’s coding. Just as you can use English to write fiction, you can use it to write a manual. Programming languages are the same. Well, maybe a bit more concise and confined, but the point is, you can flick around bytes on a bus or thousands at a time in CUDA. You can draw a triangle for a game or create a template UI with the click of a button and fill in the blanks. It’s all ‘coding’, but wildly different.
You might have heard about the meme that coders are wizards comanding magical stones, aka processors. Sometimes, we might as well be. Computer scientists come up with stuff so briliant that even the best of their own can hardly understand it. They write stuff that does stuff for stuff that does stuff for the stuff you wrote, and all of a sudden you did something without even really knowing what happened or how it works.
With that in mind, I can explain what I do in one sentence or countless hours. I write stuff to test stuff that absolutely has to work. The devil is in the detail.
Note that you can share games from GOG, but it is illegal probably everywhere where GOG is available and if law enforcement ever catches on, you’re fucked.
Afaik this is not happening right now, but there’s nothing stopping GOG from poisoning your downloads in a way that ties all copies to your account