Sites are containers for lists, document libraries, and Web pages pre-populated with Web Parts.
The initial site created in a Windows SharePoint Services site collection is called the top-level site.
To create a child site, you must navigate to the New SharePoint Site page.
Don’t use spaces in site names, and keep them short and intuitive.
Sites are easy to create and secure.
Only after a site is using unique permissions can you manage its users and SharePoint groups.
Permission levels are a named collection of permissions.
All associated permissions are aggregated and the cumulative list of unique permissions apply.
Each site can have its own theme.
Sites can be saved as custom templates and immediately be used to create other clone sites in a site collection.
Some installed Features can be activated at the Site Collection level, while others can be activated on a site-by-site basis.
Sites can allow or disallow RSS feeds on the lists contained within them.
Deleting a site sends it to the Recycle Bin in Windows SharePoint Services, from where it can be restored.