what are the 4 software features from one company to protect a Mac computer?

Any Third Party Applications that will interfere with the normal operation of the OS, alter, modify, remove or delete or attempt to do so is an invitation for disaster and comprising the Operating System

Any of the below should be removed as per Developers Instructions 

Avast AntiVirus and read the many posting Specific to this software

There are no known Windows-like Viruses in the wild that self replicate and affect macOS, because of the underling UNIX  Foundation and Permission Limitation. 

Additionally, and specific to Big Sur macOS 11 and Monterey macOS 12, the Operating System resides in a Sealed and Read Only Volume that can not be opened by the User or “ Bad Actor “ Software.

The Only thing this Antivirus software is protecting is the Bank Account of the Developers and for zero return to the User aside from the problems this software creates.

The The Built in Security  is all that is required to protect the computer.

There has been sufficient advise offered for the User to make an informed and educated choice what the next course of action is required.

The suggestions have been put forth on a volunteer basis, in good faith and in the best interests of the computer.

The idea that third parties, with no special knowledge of MacOS internals, are capable of providing "protection" that Apple somehow can't or won't provide is laughable.

These pitches are encouraging you to be fearful, so that you will buy these third-party products. They are reprehensible money grabs.

this Apple technical document should add more information:

https://support.apple.com/guide/security/welcome/web

Nothing that is worth having.

Mainly what it does is scan your files non-stop, wasting resources at a phenomenal rate. It is comparing patterns in files with patterns in obsolete Windows software viruses. it is likely that there WILL be a match, such as a graphics files pattern. when that happens, your Mac will crash without so much as an error message.

But NONE of that is any threat to your already well protected Macintosh. Your Mac protects you from having bad stuff become EXECUTABLE without your explicit permission.

AVAST (and others like it) are so close to being a total scam, they are almost indistinguishable.

nothing is going to work better than common sense and education.

Keep your Mac up-to-date with security patches and OS updates. It is the best software protection policy out there.

Apple builds in the features you nee to protect your Mac:

Effective defenses against malware and ot… - Apple Community

You should check with Avast - they will make claims of course. Most Mac users won't install that kind of stuff, so I am not interested in any claims they make. And I will not install it to test it.