In short, on a Unix-based system, you can download the Git source code from the Git Download Page, and then run something along the lines of :
$ make prefix=/usr all ;# as yourself $ make prefix=/usr install ;# as root
If you are running Linux, you can likely install Git easily via your native package management system:
$ yum install git-core $ apt-get install git-core
If that doesn't work, you can download the .deb or .rpm packages from here:
If you prefer to install from source on a Linux system, this article may be helpful:
Once MacPorts is installed, all you should have to do is:
$ sudo port install git-core
If you prefer to install from source, these articles may be helpful:
With Leopard, you can also install via MacPorts, but here you have the additional option of using a nice installer, which you can download from here: Git OSX Installer
If you prefer to install it from source, these guides may be particularly helpful to you :
On Windows, installing Git is pretty easy. Simply download and install the msysGit package.
See the Git on Windows chapter for a screencast demonstrating installing and using Git on Windows.