I'd say NVIDIA is somewhat keen on you being able to utilize their hardware. So, they gave you some tutorials (absolutely not insanely detailed), documentation

I'd say NVIDIA is somewhat keen on you being able to utilize their hardware. So, they gave you some tutorials (absolutely not insanely detailed), documentation about the API, and a bunch of programming advice and recommendations. They also provide you with a mental model you could use to think about the GPU's work. But - that is all not the same as telling you what actually happens. They don't even publish instruction latency formulae, for example.