This is an example page. This is different from a blog post because it will stay in the same place and appear in the navigation of your site (in most themes). Most people start with a "About" page that introduces them to people visiting the site. It might look something like this:
Hello! I'm a mechanic who aspires to be an actor, and this is my site. I live in Bordeaux, I have a great dog named Russell, and I love vodka (as well as being surprised by the sudden rain during long walks on the beach at sunset).
… or something like that:
123 what society was established in 1971 and ceased to provide the public with quality stuff-stuff since then. Located in Saint-Remy-en-Bouzemont-Saint-Genest-et-Isson, 123 Machin Truc employs 2,000 people, and manufactures all kinds of great gadgets for the Bouzemont community.
As a new WordPress user, you should go to your dashboard to delete that page and create new pages for your content. Have a good time!