This is just how I set up my Arch system with the Plasma Desktop Environment and the Xorg Display Server.
I'm installing the System on a nvme alongside with a Windows 10 Installation.
Therefore, there are already nvme0n1p1 - nvmen0n1p4 on the system, created by the windows setup. One of them is the ESP partition that will be reused as /boot/efi.
This setup will use an unencrypted /boot and an encrypted lvm container containing / and /home as well as a swap for hibernate.
When in doubt, always refer (and listen) to the Arch Linux Installation Guide.