I want to get as much opportunity and salary as possible with my CS degree, which topic should I study? I know it depends on this and that, but I mean, on average, which one is the best for a $$$ comfy life $$$ ?

There's many choices

Machine learning is a big meme right now

Data science is an old meme

Security is always important and cryptography is sick af

computer graphics?? Vidya is fun

bio informatics has potential

devsOps???

Just plain old boring software engineering?