I answered that recently here: https://old.reddit.com/r/GraphicsProgramming/comments/1fpi2c...

https://siboehm.com/articles/22/CUDA-MMM is a good start.

Programming Massively Parallel Processors: A Hands-on Approach by David Kirk and Wen-mei Hwu.

there are a thousand excellent CUDA programming courses/sites.

none of what was mentioned in this blog post is news if you've ever had more than 2 hours of a CUDA course...