Codeigniter, The right framework for security and structured, modularized web development.

Here you will see 2 video tutorials. http://codeigniter.com/tutorials/

Introduction video is here. http://codeigniter.com/tutorials/watch/intro/

Sample blog by codeifniter here. http://codeigniter.com/tutorials/watch/blog/

These helped me a lot when i started.

And this link will cover almost everything: http://codeigniter.com/user_guide/
Its wiki is further solution if you are failure to find out at user guide section.