Assuming you're using Windows and you really need antivirus, just use built in Windows Defender. While it doesn't offer best security, it's not too annoying (less false positive or annoying pop-up) and use less resource than other antivirus.
Actually forgot about this lol. If anything, the built-in Windows Defender is more than enough. And if you think about it, they have the most incentive in actually keeping your computer secure as it's from Windows themselves.