Re: Linux on the desktop - what about on the server?
Tell me: Where can you get commercial training for CentOS? Commercial support? LPI will train for all Linux. To be honest, there's almost no difference between Red Hat and Debian now: same systemd, same apps, same desktop environment. [I've CentOS 8/ 8Stream / Rocky / Almalinux and Debian 11 on one set of VMs - put a user in front of any of them and you'd only notice that the Debian is more up to date and slightly more jazzy than Rocky]. RHCE is a course which demonstrates how to pass an exam.
Dell and HPE will support Ubuntu and Debian now: Lenovo are preinstalling other Linuxes - and second hand Thinkpads are the stock machines for savvy users.