This guide will help you understand with screenshots, instructional videos and to-the-point language.
Read it here
The package manager
Installing software with Synaptic
The 3 steps: Search, mark and apply
But what if my program isn't available through Synaptic?
I installed it, but where did my program go?
How do I uninstall the program?
Installing software with the terminal
Installing a package manually (.deb, .rpm, .tar.gz, .package, klik:// → .cmg, .sh, .bin, .exe, …)