The partitions layout is pretty straightforward, it's inspired by [this section](https://wiki.archlinux.org/index.php/Dm-crypt/Encrypting_an_entire_system#Btrfs_subvolumes_with_swap) of the Arch Wiki. As you can see there's just a couple of partitions:
1. A FAT32, 512MiB sized, mounted at `/boot` for the ESP.
2. A LUKS encrypted container, which takes the rest of the disk mounted at `/` for the rootfs.
The BTRFS subvolumes layout follows the traditional and suggested layout used by Snapper, you can find it [here](https://wiki.archlinux.org/index.php/Snapper#Suggested_filesystem_layout). I only added a swap subvolume in case you need a swapfile, but it's totally optional. You'll be asked if you want it or not during the script execution. Here's a brief explanation of the BTRFS layout I chose: