The Arch Wiki describes the AUR in plain terms: it’s a user-submitted community repository of software, not warranted to be safe or even vetted by Arch maintainers, packaged to be friendly with pacman.
If you’re doing things the “Arch way” the differences between the AUR and officially supported packages should be obvious, and you should at the very least skim the PKGBUILD files to understand where things are coming from and how they work.
The Arch Wiki describes the AUR in plain terms: it’s a user-submitted community repository of software, not warranted to be safe or even vetted by Arch maintainers, packaged to be friendly with pacman.
If you’re doing things the “Arch way” the differences between the AUR and officially supported packages should be obvious, and you should at the very least skim the PKGBUILD files to understand where things are coming from and how they work.