If you are interested in security on macOS, then you will want to see the presentation by Rich Trouton (his blog is Der Flounder) at X World 2016. Trouton is a long time Mac System and Server Administrator. Trouton gave a talk entitled “OS X Security – Defense in Depth”.
This delves rather deeply into how macOS handles security and tries to protect you from malware. A PDF of the 100 slide presentation can be downloaded here.
If you are a Mac user and have any interest in Security, you should read through the presentation.