https://training.github.com/kit/courses/github-for-developers.html This readme file describes the standards and procedures for using this repository
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http://www.surveygizmo.com/s3/2443418/GitHub-for-Developers-RSA-11-12-2015
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https://help.github.com/articles/closing-issues-via-commit-messages/
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https://help.github.com/articles/caching-your-github-password-in-git/
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for the difference in push/pull between Git and Mercurial: