If you are doing X11, for example, you can go low-level or pick any of a number of high-level libraries. The tutorial assumes you understand C and basic Linux programming. It has two sections, really.

Ubuntu is one of the most customizable operating systems available. In order to begin to understand the various complexities of the system, you need to become familiar with the most basic commands at ...

Many users who try Linux for the first time can get confused easily as their is no readily apparent help system available to them. As Windows programs are typically graphical in nature, it is not ...

If you're not yet comfortable with writing scripts on Unix and Linux systems, this post might get you off to a healthy start.