i started in january of this year because i upgraded my wife's computer. that gave me an old computer to tinker with.

i recommend getting an old computer, installing an OS (look up thinks like truenas, proxmox, unraid... there are more and they are different; try them all out if you want to see what you like)

then go onto youtube and search for things like " beginner" and you will get a bunch of tips/tricks/tutorials/etc. for starting out with your favorite.