This is an example of a page. It is different from an article because it is 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 study to be an actor at night. This is my website. I live in Lisbon, have a dog named Belarmino and like caipirinhas (and watching the grass grow).
... or something like that:
Gambozinos XPTO was founded in 1971 and has been providing the highest quality gambuzinos to its customers ever since. Located in Gotham, Gambozinos XPTO employs over 2,000 employees, and is a pillar 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!