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, 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.ext and includes the necessary front matter. Take a look at the source for this post to get an idea about how it works.

Jekyll also offers powerful support for code snippets:

=begin
  Dummy class nested inside a dummy module
  Private API
=end
module Foo
  class Bar
    LIPSUM = "lorem ipsum dolor sit"

    attr_reader :layout

    def initialize
      @layout = Layout.new
    end

    # instance method
    def profile
      measure_time do
        compile layout
        layout.render_with Bar::LIPSUM
      end
    end
  end
end

# Execute code
Foo::Bar.new.profile

Check out the Jekyll docs for more info on how to get the most out of Jekyll. File all bugs/feature requests at Jekyll’s GitHub repo. If you have questions, you can ask them on Jekyll Talk.