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This is a personal guide!
Though if it ends up helping you out, cool.

• A UEFI system
• Only boot and root partitions wanted
• No dual boot, whole disk is needed
• Use of nano
• Use of GRUB

Create this partitioning layout on your disk:

Using fdisk
More about disk prep

First, list all the disks on your system.

fdisk -l

Then, enter the partitioning interface by selecting the disk to partition.

fdisk /dev/sda

Use:

• g to create a new table
• d to delete unwanted partitions
• n to create new partitions
• t to change a partition type
• p to print the current table
• w to write changes to the disk

When done, format the partitions.

mkfs.fat -F32 /dev/sda1
mkfs.ext4 /dev/sda2

Connect to WiFi.

Using iwctl

Invoke the utility.

iwctl

Use:

• device list to list your wireless interfaces and devices.
• station wlan0 scan to scan for networks.
• station wlan0 get-networks to see a list of networks found in scanning.
• station wlan0 connect NAMEOFNETWORK to connect to your network.

Test your internet using a ping.

ping google.com

Hit Ctrl + C to stop the ongoing ping.

For the fastest possible downloads, update your mirrorlist.

Using reflector

Install it, if it has not already been installed.

pacman -Syy
pacman -S reflector

Backups are good. Make one of your current mirrorlist.

cp /etc/pacman.d/mirrorlist /etc/pacman.d/mirrorlist.bak

Invoke reflector to overwrite your current mirrorlist.

reflector -c "US" -f 12 -l 10 -n 12 --save /etc/pacman.d/mirrorlist

Mount the root filesystem.

mount /dev/sda2 /mnt

Use the pacstrap script to install necessary packages.

pacstrap /mnt base linux linux-firmware nano

Generate the fstab file.

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

Behold the power of root access.

arch-chroot /mnt

Adjust your timezone. Use q to exit the list.

timedatectl list-timezones
timedatectl set-timezone America/Los_Angeles

Adjust locale. When opening locale.gen, uncomment your locale of choice marked UTF-8, save and exit.

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

Configure network. Choose any name in place of myarch.

echo myarch > /etc/hostname
nano /etc/hosts

# Add this into /etc/hosts:
127.0.0.1  localhost
::1        localhost
127.0.1.1  myarch

Set the root password.

passwd

You cannot behold root power for too long. Create a user account. When in visudo, scroll to "Uncomment to allow users of group wheel..." and uncomment.

pacman -S sudo
useradd -m -g users -G wheel totallycoolname
passwd totallycoolname
EDITOR=nano visudo

Install GRUB.

pacman -S grub efibootmgr

Make a directory for the boot partition.

mkdir /boot/efi

Mount it to the boot partition of your disk.

mount /dev/sda1 /boot/efi

Install GRUB... again? Well, on the MBR this time.

grub-install --target=x86_64-efi --bootloader-id=grub_uefi --recheck

Create the locale directory, if the first command does not reveal one.

ls -l /boot/grub
mkdir /boot/grub/locale

Copy your current locale to GRUB's locale.

cp /usr/share/locale/en\@quot/LC_MESSAGES/grub.mo /boot/grub/locale/en.mo

Generate the GRUB configuration file.

grub-mkconfig -o /boot/grub/grub.cfg

Exit the chroot environment.

exit

Unmount all disks and partitions.

umount -a

Reboot. Keep the installation medium in case something went wrong, so you can reboot into it, remount the root partition, and make changes as root.

shutdown now

What are you doing without a desktop environment? Unless you're too hackerman for one.

pacman -S plasma-desktop sddm plasma-nm plasma-pa dolphin konsole kdeplasma-addons kde-gtk-config kscreen

Enable the network manager and login screen to run at startup.

systemctl enable NetworkManager sddm