I use the built-in Microsoft Defender antivirus and run the freeware version of malwarebytes once a week or so. You can run it as a standalone scanner.
https://www.malwarebytes.com/mwb-download
I agree: Windows Defender, MalwareBytes, and stay away from dodgy websites.
If you absolutely must visit dodgy websites, use a computer that is for dodgy websites only and that you can reformat and reinstall Windows without losing anything.