This is a sample page. It's different from a blog post because it will stay in one place and appear in your site navigation (in most themes). Most people start with an 'About' page that introduces them to site visitors. It might say something like this:

Hi there! I'm a mechanic aspiring to be an actor, and this is my website. I live in Bordeaux, have an awesome dog named Russell, and enjoy vodka (as well as being surprised by sudden rain during long sunset beach walks).

...or something like this:

The 123 Widget Company was founded in 1971, and has been providing quality widgets to the public ever since. Located in Saint-Remy-en-Bouzemont-Saint-Genest-et-Isson, 123 Widget Company employs 2,000 people and makes all sorts of great gadgets for the Bouzemont community.

As a new WordPress user, you should go to your dashboard to delete this page and create new pages for your content. Have fun!