/etc/apt/sources.list : Stores the repository locations that apt uses to search for packages specific to your system
apt-get : Package handling and installation utility for Debian-based distributions
Installs packages by name and includes dependent packages during install
dpkg : Installs .deb package files on Debian-based systems
-i – Install as well as configure package
-r – Remove package
-configure– Configures a package
-c– List contents of a package
--s – List status of package (installed or not)
-apt-cache : Allows searching of named package or shows installed packages
apt-cache pkgnames– Show installed
apt-cache search– Search for named package
dpkg-reconfigure : Reconfigure an already-installed package
aptitude : High level package management interface for Debian-based distributions