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 site visitors. Something like this might look like this:
Hi there!!! I'm a bike courier by day, aspiring actor by night, and this is my website. I live in Los Angeles, have a great dog named Jack, and I love piña coladas. (And of being stuck 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. XYZ is based in Gotham City, employs over 2,000 people, and does all sorts 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!