- project/first/
The main project directory, this contains the "index.php" which is called when the project frontend is opened. - project/first/cache/
The cache directory contains cache files generated by the system and/or plugins. - project/first/images/
If you project has images to display on the frontend it's wise to place them here. - project/first/include/
Got some project specific logic, stick it here. This also contains the "db.conf.php" needed to connect to the database(s). - project/first/include/modules/
If you want to create your own project modules you'll need to place them here. - project/first/include/plugins/
This is where your own or downloaded plugins end up. - project/first/script/
Put your javascript files here for good measure. - project/first/style/
Style sheets... dump here! - project/first/templates/
Certain plugins may use templates, this is the place where they generally look.
Projects / Directories
A project is typically not much more than a database and a bunch of directories with some files in it.