If you are using any anti viruses , it is not good . Because the android's antuviruses are all fraud. Yes , it is true. Because the antivirus only put the virus in the phone and then he only remove.
It can put the viruses into your operating system also!
NOTE: - Don't download apps from unknown sources. Download it from play store only. Because unknown source apps contain viruses.
ONLY USE PLAYSTORE FOR DOWNLOADING APPS.