Question

I know Github.com uses Rails.

But what template language does Github use? And what css framework does Github use?

Answer 1

Edit

The original question was somewhat confusing and seemed to conflate Github with Rails. My answer below aimed to clarify the difference. The changes/clarifications made to the question later (after I posted my answer) have lead to the answer below to no longer respond to the question as (now) posted, but I cannot delete the answer as it has been marked as accepted…

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It’s hard to tell from the wording, but I think you’re confused about several languages/tools that are found in Rails. Maybe this will help:

• Git (http://gitscm.org/)is a version control tool (http://en.wikipedia.org/wiki/Revision_control) used frequently in Rails projects. It’s used to manage the source code in your projects (versions, branches with different functions, etc.)
• Github (https://github.com) is a place you can store source code that is managed with Git
• the default language used in Rails views is called ERB (introduction example here: http://thinkvitamin.com/code/rails-views-erb-part-1/)
• rails 3.1 uses Sass to create CSS files by default (http://sass-lang.com/)

Those are the languages you’ve mentioned having trouble with, and they’re a portion of the languages you’ll need to familiarize yourself with if you want to use Rails to its full extent.

You can learn more about Rails online (for example: http://ruby.railstutorial.org/, http://railscasts.com/), or with books (http://pragprog.com/book/rails4/agile-web-development-with-rails and http://www.manning.com/katz/ are 2 good books. The first one is easier for beginners, the second one goes into more detail and is for more advanced readers).