My setup of Arch Linux 2021 with KDE-Plasma as Desktop Environment. Mostly refered Arch Wiki.

• Download Arch Linux from https://archlinux.org/download/
• Use Belena Archer to create image and flash it into a pendrive
• Boot the PC with the pendrive loaded with the image

• If you are using Wired LAN then skip

• use iwctl to connect wirelessly to Wifi and look for network drivers in your PC

# iwctl
[iwd]# device list

• this will show you a list of network drives on your PC
• Choose wireless one (for me it was wlan0)
• Now we search for wireless networks

[iwd]# station <device name> scan
[iwd]# station <device name> get-networks

• Now we get a list of networks to connect to.

[iwd]# station device connect SSID
[iwd]# exit

• After all of this ensure that net connection is working.

# ping google.com

• Use lsblk or fdisk l to view your disk partitions
• To modify your partition disk do fdisk /dev/disk_to_partition
• If you are dual booting you don't need to create EFI Partition considering you already have a EFI.
• Create a ext4 format drive for root folder
• Create a swap space (optional but preferred)

Mount point 	Partition 	Partition type 	Suggested size
/mnt/boot or /mnt/efi1 	/dev/efi_system_partition 	EFI system partition 	At least 260 MiB
[SWAP] 	/dev/swap_partition 	Linux swap 	More than 512 MiB
/mnt 	/dev/root_partition 	Linux x86-64 root (/) 	Remainder of the device 

• Format the partitions you want to mount

# mkfs.ext4 /dev/root_partition
# mkswap /dev/swap_partition

• Mount the partitions into mnt

# mount /dev/root_partition /mnt
# mount /dev/efi_partition /mnt/boot
# swapon /dev/swap_partition

• Use pacstrap to mount linux onto /mnt.

# pacstrap /mnt base linux linux-firmware

• Generate fstab

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

• Change root into arch-chroot

# arch-chroot /mnt

• Set the time zone and set system clock to it

# ln -sf /usr/share/zoneinfo/Region/City /etc/localtime
# hwclock --systohc

• Edit /etc/locale.gen and uncomment en_US.UTF-8 UTF-8. Then generate locale

# locale-gen

• Create /etc/locale.conf file and set LANG variable.

LANG=en_US.UTF-8

• Create a hostname for your PC.

# cat >/etc/hostname
shimthearch-desktop

• Generate matching entries for hosts.

#cat >/etc/hosts
127.0.0.1	localhost
::1		localhost
127.0.1.1	shimthearch-desktop.localdomain	shimthearch-desktop

• Install neccessary packages that are needed

# pacman -S base-devel networkmanager vim git sddm xorg plasma wayland-session os-prober grub wpa_supplicant wireless_tools network-manager-applet gnome-keyring

• Setup internet so that no restart is needed

# systemctl enable NetworkManager.service
# systemctl start NetworkManager.service

• Setup user.

# pacman -S sudo
# useradd <username>
# passwd <username>

• Add user to group

# sudo usermod -a -G wheel audio video storage network

• Edit configuration of sudoers list

# EDITOR=<nano/vim> visudo

• Uncomment the wheel group line.

## Same thing without a password
%wheel ALL=(ALL) NOPASSWD: ALL

• Use OS-Prober to find your second OS. (if you are dual booting)

# os-prober
/dev/nvme0n1p1@/EFI/Microsoft/Boot/bootmgfw.efi:Windows Boot Manager:Windows:efi

• Install Grub in EFI partition.

# grub-install --target=x86_64-efi --efi-directory=/boot --bootloader-id=arch-linux

• Make config file for grub to remember

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

• Exit out of chroot by typing exit

# exit

• Unmount

# umount /mnt

• Reboot

# reboot