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

Pacman Tools

Misc

pacman-contrib

user scripts for managing pacman repos

Local Caching

pacman pacredir	share pacman downloaded packages over local network
pacman pacserve	share pacman downloaded packages over local network
pacman aurutils	scripts for working with aur, sharing over local network