This is an example of a page. It’s different from an article because it’s in the same place and appears in your site’s navigation (in most themes). The normal thing is to start with an “About me”/”About us” page, which introduces the site to visitors. It can be anything like this:

Hi, I deliver during the day, but I’m studying to be an actor at night. This is my website. I live in Lisbon, I have a dog called Belarmino and I like caipirinhas (and watching the grass grow).

… or something like that:

Gambozinos XPTO was founded in 1971 and has been providing the highest quality gambozinos to its customers ever since. Located in Gotham, XPTO Gambozinos employs more than 2,000 people and is one of the pillars of the community.

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