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 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 website. I live in Bordeaux, have a great dog named Russell, and love vodka (as well as being surprised by 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 machin-truc products 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 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!