4 hours after posting, this is currently the second comment.
The first comment assures me "NVIDIA are really keen you understand their hardware, to the extent they will give you insanely detailed tutorials on things like avoiding shared memory bank conflicts."
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.
The first comment assures me "NVIDIA are really keen you understand their hardware, to the extent they will give you insanely detailed tutorials on things like avoiding shared memory bank conflicts."
I don't know who to believe!