• Flake: configurations for code formatting, and pre-commit hooks.
• Home: Home-Manager configurations.
• Hosts: Configurations specific to individual hosts.
• Lib: Personal library and utilities.
• pkgs: Customized and additional packages.

After booting using boot usb:

• Mount your root and boot partition to /mnt and /mnt/boot
• nixos-enter --root /mnt
• NIXOS_INSTALL_BOOTLOADER=1 /nix/var/nix/profiles/system/bin/switch-to-configuration boot