When you update your system on 
, just type
yay
yay is an alias for yay -Syu
yay is an AUR helper that is wrapper around pacman (the package manager)
Read more about pacman here:
https://wiki.archlinux.org/title/pacman
pacman -Syu
updates your system.
You only use
pacman -Syyu
when you update your mirrors.
the y in Syu is for refreshing the database
Type
man pacman
for further information