Pacman

Archlinux's package manager.
You may also be insterested in arch ABS.

Documentation

archwiki pacman	https://wiki.archlinux.org/index.php/Pacman
archwiki PKGBUILD	https://wiki.archlinux.org/title/PKGBUILD
archwiki mirrors	https://wiki.archlinux.org/index.php/Mirrors
latest mirrorlist	https://archlinux.org/mirrorlist/?ip_version=4

Locations

/etc/pacman.conf	configure which repos to pull from (core, extra, communnity, multilib)
/etc/pacman.d/mirrorlist	configure which sources to pull from (waterloo, queensu etc)
/var/cache/pacman/pkg	currently installed programs. Can use these archives to rollback to older versions of program.
/var/log/pacman.log	history of pacman operations
/var/lib/pacman/db.lck	pacman lockfile

Notes

pacman usage

pacman configuration

pacman packages

pacman troubleshooting