This portal talks about package management. Technical language could be used.
If you just want to know how to install and update applications in the simplest way, see the QuickPackageManagement portal.
what is Package
using
?DebianPackageDocumentation
advanced
using
?ExcludePackageFromInstallation
administrating
developing
DebianReference/Package Debian Reference - The Debian package management
French
?fr/PackageManagement/Tools
Current package management tools
dpkg – Debian package file installer
Old tools
See also: Apt