How can I set up an editor to work with Git on Windows?
Building on Darren's answer, to use Notepad++ you can simply do this (all on one line):
git config --global core.editor "'C:/Program Files/Notepad++/notepad++.exe' -multiInst -notabbar -nosession -noPlugin"
Obviously, the C:/Program Files/Notepad++/notepad++.exe part should be the path to the Notepad++ executable on your system. For example, it might be C:/Program Files (x86)/Notepad++/notepad++.exe.
It works like a charm for me.
Article How to set Notepad++ as the default Git editor for commits instead of Vim explains parameters of the command.