The short version is for me is, programming a GPU via a GPU API is like programming Assembly Language. If you want easy you use a higher level language like Python. Python is "usually" slower than assembly language but you can read a file, add up all the numbers in it, and print out the answer in 1 line of code where as in assembly here's lots of setup to read files, buffer their input, parse them into numbers, etc.
Maybe you want Use.GPU
https://usegpu.live/