Perhaps better is about certificates to get started. Safari: Using encryption and secure connections - starts with the basics, but gets technical quickly.Apple ID: Tips for protecting the security of your account - great tips on account hygiene, applicable for all online accounts.
This "immune system" consists of sandboxed application design, entitlements to let developers express intent when they need out of the sandbox, signed code to prevent modifications that turn a known app malicious, App Store distribution, system integrity protection, XProtect file quarantine mechanism with a free online update service.
The simple fact is that malware has always existed for Mac OS (OS X and macOS), so the statement that a Mac can't get malware is patently, demonstrably and dangerously false.Ī second fact is that Apple has done a good job with technology to make the macOS ecosystem largely immune to most threats.