Comment by jamesbelchamber

Get them to install WordPress on a different second-hand computer. Other things exist to host but WordPress has a lot of resources out there, and going from bare metal to WordPress introduces a lot of staples of Linux systems administration while still being fairly easy to do.

FWIW this is what I recommend to adults wanting to get into the industry as well, I would just usually direct them from there towards automation, containerisation etc. For kids I would point out that they could host other things instead of WordPress, or even write their own..