How can I protect my phone from viruses? What is the best antiviruses program?

Many programs but the best programs are least asked to know a lot of privacy information

 I don't think you need any antivirus to be installed.

Use only those apps that you trust.

Every app before downloading asks for certain permissions.Once you give them permission, they can access all those things without your permission.

(It is something like giving a duplicate key to those apps)

so download only trustworthy apps.