Former GPU guy here. Yeah, that's exactly what I was going to suggest too, with emphasis on #2 and #3. What kind of jobs are they trying to apply for? Is it really CUDA that they need to be familiar with, or CUDA-based libraries like cuDNN, cuBLAS, cuFFT, etc?
Understanding the fundamentals of parallel programming comes first, IMO.
I am not the person you asked the question of, but you might find the following useful (in addition to the ones mentioned in my other comments);
Foundations of Multithreaded, Parallel, and Distributed Programming by Gregory Andrews - An old classic but still very good explanations of concurrent algorithmic concepts.
Parallel Programming: Concepts and Practice by Bertil Schmidt et.al. - A relatively recent book with comprehensive coverage.
> Understanding the fundamentals of parallel programming comes first, IMO.
Are there any good resources you’d recommend for that?