Next you can update your site name, avatar and other options using the _config.yml file in the root of your repository (shown below).

The easiest way to make your first post is to edit this one. Go into /_posts/ and update the Hello World markdown file. For more instructions head over to the Jekyll Now repository on GitHub.

Learning how to create a github pages blog.

Getting Started with Jekyll on Windows

Build a blog with jekyll and github pages

Prose