This page is 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. It might say something like this:

Hi there! I’m an action hero by day, aspiring actor by night, and this is my blog. I live in Hiawassee, have 3 great dogs named Maddy, Annie and Sable. I also like Pina Coladas (And gettin’ caught in the rain.).

…or something like this:

The XYZ Doohickey Company was founded in 1971, and has been providing quality doohickies 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.

As a new WordPress user, you should go to your dashboard to edit this page and make it yours. Have fun!