I Need help after I update my mac to High Sierra

OK, I misread your post. So it's a Safari issue since upgrading to HS. See these support topics.

If Safari doesn't load a page or webpage items are missing - Apple Support

Safari for Mac: If Safari can’t open a website

If your Mac meets the system requirements you can use this link to download it:

Get macOS High Sierra

System Requirements:

How to upgrade to macOS High Sierra - Apple Support

What model/year Mac?

What happens when you try to navigate to the sites?

What browser?

Are you running any third party apps that claim to protect, clean?