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In general, the first thing you will want to do after Getting Started, will be to create your first page or post.  There are very key differences between posts and pages in your WordPress website.

Posts

Posts are listed in reverse chronological order on the blog home page or on the posts page if you have set one in Settings > Reading. If you have created any sticky posts, those will appear before the other posts. Posts can be found in the Archives, Categories, Recent Posts, and other widgets. Posts are also displayed in the RSS feed of the blog. You can control how many posts are displayed at a time in the Reading Settings. The URL for a post includes the date the post was published like this: http://blogname.wordpress.com/2008/11/30/post-title/

See Posts for more detailed information.

Pages

Pages are static and are not listed by date. Pages do not use tags or categories. An ‘About’ page is the classic example. Pages are displayed in the sidebar using the Pages widget, and some themes display pages in tabs at the top of the blog. If you have 50 pages and you use the Pages widget, then all pages will be listed all the time. The URL for a page looks like this: http://blogname.wordpress.com/page-title/