How easy does an Apple computer get malware

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

There is Adware & Malware which will affect the computer and is generally downloaded from “ Shady “ Websites or Developers who Inject this software into the download.

Should “ Certain & Specific Software “ referenced from above be installed - it will negatively impact macOS. It is suggested, to download directly from the Developer , the application Malwarebytes for Mac. 

It is free or paid for added features. 

Run the Application and it should remove the malware / adware. Once done, restart computer and test.

Here is another article written by a respected forum contributor which expands upon this detail:

Phony "tech support" / "ransomware" popup web pages - Apple Community

Also, read the great article @BobTheFisherman linked as well for other ways to keep you & your devices safe and running well.

This may help you:

Effective defenses against malware and ot… - Apple Community

MaccMe55 Said:

"How easy does an Apple computer get malware: Really weird responses for many uses of my computer. It started about 10 days ago. Help!"

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Commonality of Malware on a Mac:

It is easy to get it on your Mac. It would install from downloads and interactivity with sites. So, what are these messages in regards to? Do they show up intermittently? OR do they show up when you open an app.

In direct proportion to the user's naiveté regarding sites where files are downloaded, since this will constitute the highest vector for malware infection. Others have posted useful links to help you minimize future malware infections.

... It started about 10 days ago. Help!

What started 10 days ago?