If you're using a mainstream desktop Linux - Debian, Ubuntu, Raspbian, Fedora, etc. - then you can probably just use your package manager and be up and running in a few minutes. For example, on most of my machines, I would open a terminal (Gnome Terminal, xterm, LXTerm, etc.) and type:
sudo apt-get update sudo apt-get install git git-gui gitk
On an RPM-based distribution, I would do:
sudo yum install git git-gui gitk
You can also install from source, but usually that should be unnecessary unless your system is very out of date.
Notice those extra packages, git-gui and gitk? You might as well leave those off if you're running a text-only system (like a Raspberry Pi that you only access over a console cable), but on graphical desktops they're helpful tools for quickly committing work and reviewing history.
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