what if I don’t have itunes on my computer

mikajake wrote:

I forgot my iphone 7 plus passcode and I don’t have itunes or else on my computer ?

Above reply is correct.

Install iTunes (on Windows), or use Finder (on recent macOS) or iTunes (on older macOS).

More info:

If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support

Locate and view your connected device on your computer - Apple Support

Download and use iTunes for Windows - Apple Support

Then install iTunes on your computer