Turn off broadcast of the SSID (meaning that your network isn’t seen when someone looks at available networks).
PiHole is probably more advanced than you’re ready to explore given your present level of knowledge, but I’d encourage you to dive in if you consider the concept interesting. You might develop a new hobby. If you have a tech-interested friend, you might ask them to set one up on your behalf.
I’d be happy to check its contents on MacOS or Linux. But I also agree with the virustotal recommendation.