Posts are entries 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:
If you want your posts to appear on a page other than your home page, read this: Front Page.
See Posts for more detailed information.