Bitdefender was notorious for flagging legit applications. When I was using it few years back, instead of asking me what to do with the application, it just blacklisted it. The application was Rocket League launched from Steam.
Windows Defender + Malwarebyte + Sensible browsing(very important). This is suggested several times by several members here. I follow this diligently now.
I stopped downloading dlls to run ahem games, stopped downloading movies from shady sites and opted for platform subscriptions. Don't go to sites which are flagged by Windows/Malwarebytes. Vet heavily whatever application you want to download and only then proceed to download from official source.