Why is safari not loading

without any information from you i can only recommend some basic steps. first you can look at If Safari is slow, stops responding, quits unexpectedly, or has other issues - Apple Support.

if the answer cannot be found on that page, you can try starting up in safe mode and see if the problem still occurs.

How to use safe mode on your Mac - Apple Support

if that doesn't help, come back here with a description of the issues you are experiencing so we can possibly narrow down your issue.