How to create and submit Git patch

Some open-source projects prefer submitting Git patch files to pull requests.

OpenVpn: https://community.openvpn.net/openvpn/wiki/DeveloperDocumentation
Linux kernel: https://www.kernel.org/doc/Documentation/SubmittingPatches

https://shkspr.mobi/blog/2014/04/submitting-trivial-linux-kernel-patches/
https://kernelnewbies.org/FirstKernelPatch
https://www.kernel.org/doc/Documentation/SubmittingPatches
https://www.kernel.org/pub/software/scm/git/docs/git-format-patch.html
https://git-scm.com/docs/git-format-patch

http://who-t.blogspot.co.uk/2009/12/on-commit-messages.html