A site itself. Sites are basically collections of content, so you can create sites underneath your main SharePoint site (kind of like large folders on your file system) to collect related materials that deserve their own focus. Meetings, blogs, documents and teams might have their own sites. If the hierarchy is confusing, think of it like this: A site is a file drawer in a file cabinet, and the libraries, lists and other types of content are the individual folders within that file drawer. (See example.)
Microsoft includes templates that can be used to create a featured content type, including meeting workspaces and issue-tracking lists.Click to view larger image.
A list. Lists are collections of like items. You can choose from announcements, a calendar, a list of contacts, a custom list in both list form and an editable datasheet form, a discussion board, an issue tracking list, a list of links, a list of project tasks (with a Gantt-like chart), a survey, a task list or an imported Excel spreadsheet. (See example.)
Content based on a template. There are many default templates in SharePoint that you can use to quickly create a featured content type, including meeting workspaces, issue tracking lists and more.
What's new in SharePoint 2010
Like much of the Microsoft Office family, SharePoint 2010 is based around the concept of the Ribbon, Microsoft's interface that displays all of the options, choices and operations you can perform on any given page. It differs a lot from SharePoint 2007, which didn't have the Ribbon, but many of the same options are there -- just in a different place.
Key portions of the SharePoint 2010 interface.Click to view larger image.
The Site Actions menu. This is where all of the action happens, literally. From here you can create new pages, document libraries and SharePoint-based sites; edit the pages you see; synchronize an offline copy of the site to the SharePoint Workspace application (assuming you have that feature as part of Office 2010); and access settings to customize the sites' accessibility and permissions. To change major aspects of sites within SharePoint or to create new items, you'll probably want to go to the Site Actions menu first.
The Credentials area. This menu, accessed when you click on your display name in the top right corner of the Web page, is where you sign into or out of a site, and where you change any user-modifiable sections of the Web page.