This is a sample page. It differs from a post because it is located in a fixed place and displayed in your site navigation (in most themes). Many people start with an About page that introduces themselves to site visitors. It can tell something like this:

Hello all! I am a mail carrier by day and in the evening I keep myself busy with acting. I live in Amsterdam and have a dachshund named Hecktor and love strong coffee

...Or something like this:

Established in 1971, the XYZ association delivers quality to its members. The association has had more than 1,000 members since its inception, many of whom volunteer tasks to keep XYZ in existence.

As a new WordPress user, go to your dashboard to delete this page and create new pages for your site. Have fun!