Chrome browser > Settings. Go to Content. Click URL Blocking and enter URLs as needed : Blocked URLs—URLs that you want to prevent users from accessing.
There is a way to block sites from being viewed or used. You can open site and in your URL box you will see a small padlock icon , click on it and go to site ...
The easiest way to block websites on Chrome is with an extension. Only a Google Admin Account can block a website on Chrome without using an extension.