github pages or gh-pages). They will end up being published at yourusername.github.io/repositoryname.For example, the home for this website is https://poldham.github.io/minute_website/
But, this is where we need to take care. In the image above on the left we can see that next to Branch it says master. Websites are published on the github pages branch (gh-pages) branch of a repository to keep them separate (because your repository data and your project website may be quite different things). So, your website is not yet published.
To publish the website we need to go into Settings in our repository and then scroll down. In the image below, where you see master in your repo change the branch to gh-pages. Your simple website will now build at the address given. You are reading this online so it must do. 
If you have forked and cloned this site then all should be good, because the master branch has been deleted leaving only the gh-pages branch. However, if you have started from scratch you will need the procedure above.
output_dir: "." at the bottom of _site.yml..nojekyll in your main site folder._site folder when you updated… easy to forget).gh-pages branch in Settings in your repo.