git diff side-by-side

During committing of larger feature over GIT, I recognised a need to perform a side by side diffs instead the typical line-in-line diffs which are default by running git diff or the same line-by-line diff which is provided by the Fork.app

However you can do side-by-side diffs with git!

Set a diff tool of your choice:

git difftool --tool=vimdiff

Or write it to ~/.gitconfig:
[diff]
tool = vimdiff

Now you can see your changes in the vimdiff tool by running:
git difftool