From Technologic Systems Manuals
Debian Wiki

1 Overview

Debian is a lightweight, stable, and mature linux distribution that has been around since 1993 and has over 29,000 software packages. The package design is quite modular, which allows developers to pick exactly what is needed for their project without building everything from source.

2 Package Management

Debian will offer [better documentation on this subject], but this should be enough to get started.

Update packages

apt-get update
apt-get upgrade

Install packages

apt-get update
apt-get install python2.4

Remove packages

apt-get remove python2.4

Search for packages

apt-cache search nmap