Due to the new release of macOS Mojave in September we updated the El Capitan hardening guide.
The hardening guide received a little revamp on some chapters which are now obsolete or had to be changed due to the new features of macOS Mojave. Further, the hardening guide got extended for the new privacy features in macOS Mojave.
You can check it out here. We hope some of you might find it helpful.
Cheers,
Birk