Fluency with git (or Mercurial, or any other distributed SCM) will boost your developer productivity more than any new language, framework, design pattern, editor, or methodology.
When used properly, distributed SCM is the one technology that allows useful collaboration among developers where it actually counts: in the source code. I’d even venture to say that it makes a dent in Brook’s Law.
With that in mind, I will not be surprised when GitHub gets its multi-billion dollar valuation.
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