You've already received a lot of great answers and links, but to address the one point in particular, there no official guide for this information.
By that, I don't mean any of the advice and links given so far aren't true. They are all factual. I'm referring to finding truthful information online in general.
When you do a search for "mac viruses", you get a ridiculous number of matches. Problem is, every single one of them stating they have a list of viruses is wrong. You get straight out lies, even from security companies that should know better. Like this one:
https://us.norton.com/blog/malware/can-macs-get-viruses
They say yes. But if you look at the list of "virus" types, every single one of them is a Trojan. Viruses are, specifically, self-replicating software. They require no action on the part of the user to spread. All items listed on Norton's page are Trojans. All such malware requires the user to do something to infect your Mac. None of it can get there by itself.
I find it both galling and just plain deceitful for any security to call a Trojan a virus. They should know better, but calling them viruses is nothing but click bait. It draws users in on a search. Worse, it perpetuates the idea there are indeed Mac viruses because, well, Norton said so. And they can't be wrong, can they?
This is only one of many sites you can find making the same mistake. Often because they:
- Don't know any better (in which case they shouldn't be writing their junk in the first place)
- Don't know the difference between different types of malware (virus, Trojan, worm)
- Do it on purpose as click bait
- Incorrectly use "virus" as a catch-all term. We have one for that - malware. Which stands for malicious software, and covers any of the base categories. Which again, are viruses, Trojans and worms.