Don't worry yourself about virus on the Mac. They don't exist.
Definition of a virus: Something that can infect a computer WITHOUT user interaction.
All new software on Mac requires user interaction. So the only way MALWARE can get into the system, is to sneak past you. Either with software that claims to do a little too much for free, or a fake update. There have been a few compromised Mac Apps in the past. But they got detected and taken care of.
The best advice is, things like YouTube downloaders and other software that promises something a little too good to be true is a good thing to be careful with. Google them before installing them.
For fake updates, that is going to be quite a lot harder, for the malicious people making them, with the new Gatekeeper in macOS Mojave. So less worry there
And the final nail in the coffin. All the Virus scanners only search for KNOWN malware, which means unlike their PC counterparts they don't seem to have pattern recognition. So when fake updates or new malware is released, they won't react to it, and they DIDN'T do so in the case of the past two largest attempts on the Mac, fake updates of Handbrake and Transmission. The anti-virus software needed a definition update too, before they could deal with it.
Should the accident strike, Malwarebytes would be the preferred tool to clean it up. But note, it is for cleanup, not preventing.
They say the paid version can keep malware from getting in, but I remain skeptical, I havn't seen proof of that yet.
I have had Mac for the past 11 years, never has a single piece of malware or adware ever infected my Mac. I even use Handbrake and Transmission, and neither managed to get me.
