Welcome to Jekyll!
You’ll find this post in your _posts directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in many different ways, but the most common way is to run jekyll serve –watch, which launches a web server and auto-regenerates your site when a file is updated. To add new posts, simply add a file in the _posts directory that follows the convention YYYY-MM-DD-name-of-post.