tldr; google engineer says you dont need an antivirus. you just need windows defender because antivirus nowadays dont implement good coding practice and therefore fucks up your browser. browsers like firefox knows this but keeps quiet because they dont want these antivirus companies to brand them as "unsafe"
i dont use any either. i only use windows defender.
depends, I think AV is becoming redundant due to Zero Day Malware, however there is still some Malware out there that AV can pickup, I would chose malware bytes because its very light weight
Adblock & scan with malwarebytes once in a while and you'll be golden. Make sure
To stop that shit from starting with Windows, and turn that shitty real time protection off.
Anti-Virus is really useless, and is for idiots. Don't download any untrusted files. Check the checksums of trusted files. If you think you're infected, take the proper steps necessary to clean your PC. Most AV are nothing but overrated bloatware. I would recommend downloading MBAM (