This is a sample page. It differs from posts because it always remains in the same place and (for most themes) is displayed in the navigation. Most people start with an imprint or a "About Us" page with an idea for possible visitors to the site. For example, there might be:
Hello! During the day I work as a bicycle courier, at night I am an aspiring actor and this is my website. I live in Berlin, have a big dog named Jack, like Piña Coladas, but less (without umbrella) to be left in the rain.
… or something like:
Our company XYZ was founded in 1971 and since then has produced a lot of high quality ABC for the public. Based in Gotham City, XYZ now has over 2,000 employees and is constantly developing great things for the entire Gotham community.
As a new WordPress user, you should visit the dashboard to delete this page and instead create a new page with your own content. Have fun!