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I wrote a Guide on how to install Arch Linux with BTRFS and (almost) Full Disk encrytion
(veprogames.github.io)
The beloved lightweight distro
Honestly, the best thing I learned was:
Need to fix your system through the install medium? Save yourself keystrokes of mounting by just mounting the root subvolume (to /mnt) and then type: mount -aT /mnt/etc/fstab --target-prefix /mnt. This reads your fstab and mounts everything for you.
Thank you so much for it :D