This is an example page. It is different from a blog post because it will stay in the same place and will appear in the navigation of your site (in most themes). Most people start with an "About" page that introduces them to visitors to the site. It might look something like this :

Hello ! I'm a mechanic who aspires to become 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 Machin Truc was founded in 1971, and has been offering quality machine-things to the public ever since. Located in Saint-Remy-en-Bouzemont-Saint-Genest-et-Isson, 123 Machin Truc employs 2,000 people, and manufactures all kinds of great things 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!