I know that Linux is more secure than Windows and normally doesn’t need an antivirus, but know myself I’m gonna end up downloading something at some point from somewhere on the internet, and it would be good to be prepared. So, which antivirus would you recommend for Linux (Mint specifically) just to double up on security?
Install the apparmor profiles and extra profiles packages from the apt repository. They are sensible restrictions on common apps (web browsers) to prevent anything malicious from happening if they are ever hijacked. Make sure apparmor is enabled. This will do more to keep you secure than an antivirus.
If you insist on an AV, install ClamAV and have it scan weekly. It’s libre software and works well with Linux.