One of the first steps in customizing your Joomla! site is figuring out where to go to find the files you need to change. Table B.1 shows the locations of the items that are most commonly modified by site owners.
The table's contents provide the locations of the key files used by the front-end components and modules, as well as the locations of the language packs, the default images, and perhaps most importantly, the front-end and admin Templates and CSS files.
Note that the location given is the path to the files on your server, relative to directory where you have placed your Joomla! installation.
Table B.1. Key Files
Components (front-end output)
Site Modules (front-end output)
Custom HTML modules
Latest News module
Most Read module
News Flash module
Random Image module
Related Items module