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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
AFAIK GRUB itself cannot be encrypted.
The Bootloader itself cannot be encrypted afaik, but the Kernel and initrd can reside on a LUKS Volume (GRUB_USE_CRYPTODISK). But, in order to prevent having to input your passphrase twice, you need to use a keyfile, and I have no experience with that, so I have gone another route. I don't think that a kernel and initrd necessarily need to be encrypted