Safari doesn’t work

Hi guys!

Thank you so much for your help and for your time!

I’ve got a problem with my macOS Sierra.

Safari doesn’t work and I don’t know why.

I’m sure that my wi-fi is working.

In fact I was seeing a video and than safari blacked out.

I’ve tried to turn off my laptop but the problem still remains.

The first page of safari said that it doesn’t work because it’s not In a private mode.

I don’t know what to do.

Could you please help me?

Thank you for your help!

Chiara