This is an example of a page. It differs from a blog article, as it will remain at the same place, and will appear in the browsing menu on your website (depending on your theme). Most people start by writing an “About” page which introduces them to potential visitors to the website. You may write something like this:
Hi! I’m a mechanic who wishes to become an actor, and here is my blog. I live in Bordeaux, I have a wonderful dog named Russell, and I love pineapple juice with vodka (and watching the rain fall).
…or even something like this:
The company 123 Whatchamacallit was created in 1971, and has not stopped offering high-quality thingies to the public ever since. Located in Saint-Remy-en-Bouzemont-Saint-Genest-et-Isson, 123 Whatchamacallit employs 2 000 people, and manufactures all sorts of amazing contraptions for the community.
Since you are a new WordPress user, you should go to your dashboard to erase this page and create new pages with your own content. Have fun!