I’m currently a security and DevOps engineer.
DevOps is really just a fancy word for a sysadmin you can ask to code and that knows enough programming to work IAC tools.
If your goal is devOps, learning to code at all is of course the first step, but afterwards I would tend more towards learning the basics of CI/CD, python (because if you know python you can learn other languages quickly) and a healthy dose of cloud environment and IAC tools like terraform and Ansible.
PCIE 8-pin connectors supports up to 150W (12V/12.5A), but they’re meant for internal use, not chassis.
If you want to get 120W, chassis-mounted, your best bet is usb-c.
10 amps is a crazy ask. Are you trying to power the entire device with this port? If so, consider common ports (what’s wrong with IEC C14?).