Boot the Arch Linux ISO using UEFI.

Change shell to bash and reload shell:

# usermod -s /bin/bash root
# exit

Partition your storage device with GUID Partition Table (GPT) partition table:

# gdisk /dev/sda

NOTE: Make sure to create a UEFI partition. The partition type code to use in gdisk is EF00.

This is the how my SSD is partitioned:

NAME    SIZE    MOUNTPOINT
sda     500.0G
├─sda1  128.0M  part /boot/efi
├─sda2  491.9G  part /,/home/
└─sda3    8.0G  part [SWAP]

If you created a swap partition, setup the swap space and enable it:

# mkswap /dev/sda3
# swapon /dev/sda3

Make the FAT32 filesystem on the UEFI patition:

# mkfs.fat -F32 /dev/sda1

Make the BTRFS on the partition for Arch Linux:

# mkfs.btrfs /dev/sda2

Create BTRFS subvolumes:

# mount /dev/sda2 /mnt
# btrfs subvolume create /mnt/@arch
# btrfs subvolume create /mnt/@home
# btrfs subvolume create /mnt/@var
# umount /mnt

Mount the subvolumes:

# mount -o subvol=@arch /dev/sda2 /mnt
# mkdir /mnt/home
# mount -o subvol=@home /dev/sda2 /mnt/home
# mkdir /mnt/var
# mount -o subvol=@var /dev/sda2 /mnt/var

Mount the UEFI partition:

# mkdir /mnt/boot
# mount /dev/sda1 /mnt/boot

Create the base bootstrap Arch Linux root file system with linux-hardened instead of linux:

# pacstrap /mnt base linux linux-firmware nano

Create the file system table and save it:

# genfstab -p -U /mnt > /mnt/etc/fstab

Change Root chroot into your newly bootstrapped Arch Linux:

# arch-chroot /mnt /bin/bash

Set the hostname:

# echo "leedev" > /etc/hostname

Edit hosts:

# nano /etc/hosts
-----------------
127.0.0.1  localhost
::1        localhost
127.0.1.1  leedev.localdomain  leedev

Set the system timezone and generate /etc/adjtime:

# ln -s /usr/share/zoneinfo/US/Central /etc/localtime
# hwclock --systohc

Configure and generate locales:

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

Configure the keyboard keymap console:

# echo "KEYMAP=us" > /etc/vconsole.conf

Create a group and user:

# groupadd --gid 1000 leedev
# useradd --home-dir /home/leedev --create-home --uid 1000 --gid 1000 --groups wheel,sys --shell /bin/bash leedev

Set the password for this new user:

# passwd leedev

Install a lean but complete Server or Gnome desktop environment:

Server:

# pacman -S tmux sudo openssh rsync bash-completion git btrfs-progs ecryptfs-utils efibootmgr

Notebook:

# pacman -S tmux sudo openssh rsync bash-completion git btrfs-progs ecryptfs-utils base-devel sysstat gdm gnome-shell gnome-terminal nautilus gnome-control-center gnome-tweaks ttf-liberation system-config-printer gnome-backgrounds gnome-keyring gnome-disk-utility baobab gnome-screenshot cheese evince epiphany eog totem mpv geany file-roller networkmanager dhclient gst-libav libmtp ttf-freefont noto-fonts noto-fonts-cjk noto-fonts-emoji noto-fonts-extra libva-vdpau-driver libdvdcss pkgfile xorg-server xorg-xinit libvdpau xf86-video-amdgpu xf86-input-libinput mesa-vdpau mesa-libgl gst-plugins-ugly xf86-input-libinput gimp inkscape cups ghostscript gsfonts foomatic-db foomatic-db-engine foomatic-db-nonfree seahorse efibootmgr

Give the wheel group sudo permissions:

# nano /etc/sudoers.d/group_wheel
---------------------------------
Defaults:%wheel runcwd=*
%wheel ALL=(ALL) NOPASSWD: ALL

Edit /etc/shadow to prevent root login:

# nano /etc/shadow
------------------
root:!*:14871::::::

Edit /etc/mkinitcpio.conf: NOTE: For a server, read RAID.

# nano /etc/mkinitcpio.conf
---------------------------
HOOKS=(systemd autodetect modconf block filesystems keyboard)

Create the initramfs:

# mkinitcpio -P

Install CPU Microcode:

AMD:
# pacman -S amd-ucode

Intel:
# pacman -S intel-ucode

Install bootloader:

# bootctl install

Get UUID of / partition:

# blkid /dev/sda2
/dev/sda2: UUID="5e023168-f275-422e-b87f-566735100b37" UUID_SUB="1094b132-ab0a-48e5-a772-a7d092f0f66b" BLOCK_SIZE="4096" TYPE="btrfs" PARTLABEL="Linux filesystem" PARTUUID="70d16fe2-666f-4390-af97-dab0fea07583"

Create boot entries:

# nano /boot/loader/entries/arch.conf
-------------------------------------
title   Arch Linux
linux   /vmlinuz-linux
initrd  /intel-ucode.img
initrd  /initramfs-linux.img
options root=UUID=5e023168-f275-422e-b87f-566735100b37 rw rootflags=subvol=@arch mitigations=off

# nano /boot/loader/entries/arch-fallback.conf
----------------------------------------------
title   Arch Linux (fallback initramfs)
linux   /vmlinuz-linux
initrd  /intel-ucode.img
initrd  /initramfs-linux-fallback.img
options root=UUID=5e023168-f275-422e-b87f-566735100b37 rw rootflags=subvol=@arch mitigations=off

Setup loader.conf:

# nano /boot/loader/loader.conf
-------------------------------
default  arch.conf
timeout  1
console-mode max
editor   no

Configure the services to start at boot:

Server: NOTE: Configure systemd-resolved and systemd-networkd.

# systemctl enable sshd.service systemd-timesyncd.service systemd-resolved.service systemd-networkd.service

Notebook:

# systemctl enable sshd.service systemd-timesyncd.service systemd-resolved.service NetworkManager.service gdm.service cups.service

Exit the chroot:

# exit

Unmount the newly created file systems:

# umount -R /mnt

Reboot and enjoy Arch Linux:

# reboot