[ 1. VERIFY BOOT MODE ]
cat /sys/firmware/efi/fw_platform_size
(64 = UEFI x64, 32 = UEFI x32, no file = BIOS/CSM)

[ 2. CONNECT TO THE INTERNET ]
Ethernet: plug the cable.

Wi-Fi via iwctl:
iwctl
[iwd]# device list
[iwd]# device "adapter" set-property Powered on
[iwd]# station "adapter" scan
[iwd]# station "adapter" get-networks
[iwd]# station "adapter" connect SSID
Hidden network:
[iwd]# station "adapter" connect-hidden SSID

[ 3. SYNC THE CLOCK ]
timedatectl set-ntp true
timedatectl status

[ 4. PARTITION THE DISK ]
fdisk -l
cfdisk /dev/disk
Select GPT.

Create EFI partition (only if missing):
Free space -> New -> 512M -> Type: EFI System

Create ROOT partition:
Free space -> New -> full size -> Type: Linux filesystem

[ 5. FORMAT THE PARTITIONS ]
mkfs.fat -F32 /dev/efi_partition (only if you created a new EFI)
mkfs.ext4 /dev/root_partition

[ 6. MOUNT THE PARTITIONS ]
mount /dev/root_partition /mnt
mount --mkdir /dev/efi_partition /mnt/boot/efi

[ 7. INSTALLATION ]
AMD:
pacstrap -K /mnt base linux linux-firmware nano sudo networkmanager amd-ucode

Intel:
pacstrap -K /mnt base linux linux-firmware nano sudo networkmanager intel-ucode

[ 8. GENERATE FSTAB ]
genfstab -U /mnt >> /mnt/etc/fstab
nano /mnt/etc/fstab (verify)

[ 9. CHROOT INTO SYSTEM ]
arch-chroot /mnt

[ 10. TIME ZONE ]
ln -sf /usr/share/zoneinfo/Area/Location /etc/localtime
hwclock --systohc

[ 11. LOCALIZATION ]
nano /etc/locale.gen
uncomment: en_US.UTF-8 UTF-8

locale-gen
echo "LANG=en_US.UTF-8" > /etc/locale.conf

[ 12. NETWORK CONFIG ]
nano /etc/hostname
yourhostname

nano /etc/hosts
127.0.0.1 localhost
::1 localhost
127.0.1.1 yourhostname.localdomain yourhostname

systemctl enable NetworkManager

[ 13. ROOT PASSWORD ]
passwd

[ 14. MULTILIB ]
nano /etc/pacman.conf
[multilib]
Include = /etc/pacman.d/mirrorlist

pacman -Syyu

[ 15. BOOTLOADER ]
pacman -S grub efibootmgr os-prober

nano /etc/default/grub
uncomment: GRUB_DISABLE_OS_PROBER=false

grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=GRUB
grub-mkconfig -o /boot/grub/grub.cfg

[ 16. REBOOT ]
exit
umount -R /mnt
reboot

[ 17. AFTER INSTALL (AS ROOT) ]
useradd -m -G wheel -s /bin/bash username
passwd username

EDITOR=nano visudo
uncomment: %wheel ALL=(ALL:ALL) ALL