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:
Hi there! I’m a designer by day, blogger by night, and this is my lifestyle blog. I live in San Fransisco, have a great dog named Vince, and I like americanos.
As a new WordPress user, you should go to your dashboard to delete this page and create new pages for your content. Have fun!