This page was made as an example. It’s different from a blog post because it will stay in one place and will show up in your site navigation (in most themes). Most people start with an About page that introduces them to potential site visitors. This sentence is going to be a long one which in turn will increase the lenght of the paragraph as a whole and will trigger a response from Yoast SEO saying that the sentence should be shortened and maybe should be cut into two or three different sentences. This is the best sample page ever created even if it has some minor errors. It might say something like this:

Hi there! I’m a bike messenger by day, aspiring actor by night, and this is my website. I live in Los Angeles, have a great dog named Jack, and I like piña coladas. (And gettin’ caught in the rain.)

…or something like this:

The XYZ Doohickey Company was founded in 1971, and has been providing quality doohickeys to the public ever since. Located in Gotham City, XYZ employs over 2,000 people and does all kinds of awesome things for the Gotham community.

WordPress has created this example for you, you should go to your dashboard to delete this page and create new pages for your content. Have fun!