Not secure website

In that case, I would not use that site. Please read: If you see a "Not Secure" warning while browsing the web with Safari - Apple Support for further information.

If you see a "Not Secure" warning while browsing the web in Safari - Apple Community

There are billions of web sites that will come up at Not Secure. That doesn't automatically mean they're dangerous. Only that it has not been set up to use HTTPS. My own site comes up the same way.

http://jklstudios.com/

That the site you're referring to won't open is a separate issue.