These tutorials are for Joomla! 1.5 sites only. Joomla! 1.0 sites refer to this link.
This set of tutorials is designed specifically for new Joomla! 1.5 site administrators to build their website from start to finish while at the same time yield a thorough knowledge of the platform.
It is therefore highly recommended that new site administrators go through each step of this tutorial sequentially and simultaneously with site development. In other words, develop each phase of the site as you go through the specific tutorial for that phase.
After that, visit the Advanced Tutorials section for further 'how to's'.