Git is a "version control system" used by a lot of programmers. This software can track changes to files over time so that you can recall specific versions later. A bit like the "track changes" feature in Microsoft Word, but much more powerful.

You can download Git from git-scm.com. You can hit "next" on all steps except for one; in the fifth step entitled "Adjusting your PATH environment", choose "Use Git and optional Unix tools from the Windows Command Prompt" (the bottom option). Other than that, the defaults are fine. Checkout Windows-style, commit Unix-style line endings is good.

Do not forget to restart the command prompt or powershell after the installation finished successfully.

Download Git from git-scm.com and just follow the instructions.

Note If you are running OS X 10.6, 10.7, or 10.8, you will need to install the version of git from here: Git installer for OS X Snow Leopard

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$ sudo apt-get install git

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$ sudo dnf install git

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$ sudo zypper install git