How to add Google Analytics Tracking ID to GitHub Pages

Is better to use GA-Beacon for that. GA-Beacon can track all your GitHub repo, even if the visited link isn't an html document.

Please check: https://github.com/igrigorik/ga-beacon

For anyone interested, if you are using Jekyll with GitHub pages, I just wrote a post showing how to correctly add Google Analytics Tracking ID to Jekyll.

1. You will find your Universal Analytics tracking code under Admin > Property > Tracking Info > Tracking Code.

2. Create a new file called analytics.html in the _includes folder found in your Jekyll website’s directory.

3. Add Google Analytics Tracking ID code to analytics.html.

4. Finally, open _layouts/head.html, and add {% include analytics.html %} just before the end </head> tag. Google recommends this placement to track all of the pages on your website correctly.

If you are using the minima template provide by Jekyll then -

1. Add google_analytics: UA-xxxxxxxx-x to your _config.yml
2. Create a file _includes/google-analytics.html and add the google analytics js code in it.

Replace

ga('create', 'UA-xxxxxxxx-x', 'auto');

with

ga('create', '{{ site.google_analytics }}', 'auto');

and you are set!

The google analytics code will now display if your site is built in production environment. For reference see the template's source code here - https://github.com/jekyll/minima

You can follow the same approach if you are using a different template by referencing the template's source code and replacing the corresponding files.

Update: Added steps descriptions for others

Solved it:
had to include username.github.io (link that I want to track) in Google Analytics website section.

you can check GitHub help page here

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After that I was provided with an Tracker ID.

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Note: You can easily change or add more websites on Google Analytics page from your Google Analytics admin panel.

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Update 2: - Adding Google Analytics Tracking ID to Already created Github pages (As requested by @avi-aryan )

1. Browse to your github pages branch - which would be something like -
   ( https://github.com/YourUserName/YourRepository/tree/gh-pages )
   
2. Then edit index.html from listed files
3. Now in within HEAD tag of index.html - paste your Google Analytics Tracking ID Script ( if have already signed up for Google analytics then you can browse it under admin and then tracking info tab )