You got all the good infos already, but I’ll stress:
Get Linux preinstalled from a reputable vendor. Linux works on most devices really; but when buying new, you don’t want the hassle to even think about drivers.
If you cannot buy from a Linux-friendly vendor, buy an older model that’s VERY popular with Linux users (like the stereotypical thinkpad). Again, most devices will work, but you don’t want the hassle.
Intel everything just works out-of-the-box with Open Source drivers and is good enough for work. I’m not aware of the current state of AMD, nvidia drivers.
Choose a popular generic purpose distro. They are all good (enough) and should work out of the box. Popular for end users are Ubuntu (although hated by a vocal group) and related ones such Debian or PopOS; maybe Mint. I’d put Fedora/RedHat and Suse on the same level (but I wouldn’t know since I settled on Debian/Ubuntu long ago). Then, Arch adresses a different clientele who wants to tinker with there system; not my choice if you want a computer that just works, but great community. Anything else probably has too small of a user group unless it’s popular with your friends or line of work