This is a sample page. It's different from a blog post because it will stay in the same 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 look something like this:
Hello ! I'm a mechanic who aspires to be an actor, and this is my website. I live in Bordeaux, I have a great dog named Russell, and I love vodka-pineapple (as well as being surprised by the sudden rain during long walks on the beach at sunset).
... or something like that:
The company 123 Machin Truc was created in 1971, and has been offering the public quality gizmos ever since. Located in Saint-Remy-en-Bouzemont-Saint-Genest-et-Isson, 123 Machin Truc employs 2,000 people, and manufactures all kinds of cool stuff for the Bouzemont community.
As a new user of WordPress, you should go to your dashboard to delete this page and create new pages for your content. Have fun!