[tensor]

Computer Science is math. Chef, Docker, Ansible, AWS are industry technologies. You don't go learn CS to learn these, you want a trade school instead. Industry generally doesn't even work on the same problems that university CS departments work on.

In industry, a "hard" problem is one that takes more than a few weeks to solve. In academia, a hard problem is one that you don't even know if you can solve, let alone put a time frame on it.

And yes, you can learn anything on your own, but the number of people who actually go and learn the deep maths on their own is vanishingly small.