It's only really WIndows that suffers from this. Last time I looked, there were 144,000 Windows viruses. And that was 16 years ago. Still essentially none for macOS, or for Linux. I do nothing for macOS, relying on whatever Apple has built-in (there is something but I know nothing about it). I do nothing for my Linux VMs, either.
Linux has vulnerabilities just like any system, however the attack vectors tend to be different.
Most Linux exploits are directed directly against the system over the network, rather than via an end user by email.
This is a reflection of the use cases. Tons of linux boxes are internet facing and running as servers for all manner of things. Relativly few are actually used as desktop machines. So when developing exploits you get much better reward for the effort working out how to get into a machine via one of its installed network services like Apache, WordPress, Drupal, MySQL, PHPMyAdmin etc.
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