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

Alles Käse

mehr Käse = mehr Löcher

mehr Löcher = weniger Käse

=> mehr Käse = weniger Käse

…or something like this:

Vollmond

Mit vollem Mond soll man nicht sprechen.

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