"A beginner shouldn't be installing operating systems"?
If a moderately-intelligent, moderately-literate beginner can't install your operating system, then your operating system (or at least, its user interface) is crap.
Edit: Just to be clear, I'm responding to the quote, not calling Linux crap. I run a combination of Linux and Windows machines and VMs and they're both very straightforward to install, a complete beginner can just click next / next / next and still get it working.
There are hundreds of Linux distributions with install media for usb/dvd install. Installing a distro like Fedora is as easy as setting up windows and has about the same UI quality.
Distros like Slackware or Gentoo give you more complicated setups but they are designed for experienced users.
There are so many places online to get help with a Linux install now. If you stick with the main distros as most do for there first taste of Linux its really simple.
No one installs Windows, and frankly it isn't a ton easier than installing free operating systems. It's only easier because you rarely run into driver issues, the computer was probably built to run Windows, and you're rarely trying to install it as a second operating system.
My decade's worth of experiences having to transfer over wired (wired!) NIC drivers onto computers that are completely supported by the average Linux distro because Windows doesn't ship with them strongly suggests otherwise.
Windows has thankfully gotten better about this lately (e.g. in the Windows 10 era), but the continued lack of drivers in the default install is really annoying when said drivers are for devices that virtually every free operating system supports out of the box.
UEFI? It's nice that Windows automatically finds an ESP and tosses it's bootloader on there but I wish there was some user input on the issue. It does the same thing even if you give it a separate disk.
A video where he talks about never installing his own OS.