I’m using a SteamDeck as my desktop environment while docked, I think it’s the only “Linux first” machine I’ve ever bought. All of my other systems I either built from scratch, a mish-mash of secondhand parts and purchased upgrades, or have been provided with through work.
https://wiki.archlinux.org/title/installation_guide#Partition_the_disks
https://wiki.archlinux.org/title/Partition