Blogs contain primarily two types of electronic documents (WordPress has  three but more on that later).  The two main types are Posts and Comments.

Posts are displayed in reverse chronological order, that is the latest is listed first.  They are categorized into categories which can be found in the right hand column.  Clicking on the category will show the posts in the category.  Depending on the settings, either the entire post will show or the first few lines.  I have set this blog to display an entire post.  You can navigate between posts with the arrows on top of the post.

Each post can have comments attached to it.  Comments are displayed in chronological order, meaning the earliest is shown first.  At the end of a post, you will see a box that says Leave a Comment.

WordPress supports a third type of presentation called a Page.  A page is static in that there is no hierarchy in terms of posts although you may comment on a page.  Typically, a page is used for an about, who the authors are, etc.

A blog can be read by pointing your browser to this web site, rmweb20.wordpress.com or reading the posts and comments via an RSS feed.  For the URL of the feed, see the bottom right hand column for the RSS post feed and RSS comment feed URLs.