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