Distro Recommendation for Asus C434 Chromebook (x86_64) and hopefully an up-to-date tutorial that'll work

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1

64gb of space (really 40gb if you count how much the system takes up), 4gb of ram.

2

Any distro will work really. If you want the lightest of the light, try out alpine (simply run setup-alpine, follow directions on screen, reboot, and run setup-desktop) or use an arch linux based distro