This is a sample page. It is different from a blog post because it stays in one place and appears in your site's navigation (in most themes). Most people start with an About page that introduces them to potential visitors. Something like this could be there:
Hi there!!! I'm a bike courier by day, aspiring actor by night, and this is my blog. I live in Los Angeles, have a great dog named Jack, and I love piña coladas. (And getting caught in the rain.)
...Or something like this:
The XYZ Doohickey Company was founded in 1971, and has been providing quality doohickeys to the public ever since. Based in Gotham City, XYZ employs over 2,000 people and does all kinds of great things for the Gotham community.
As a new WordPress user, you need to go to your dashboard go to delete this page and create new pages for your content. Have fun!