There are options to limit the sites your computer can access, especially if you leave it to your children and you fear that they will see inappropriate content.
How to block websites in Safari
You can block websites with Screen Time on Mac computers, here’s how:
1. Click on the Apple icon in the upper left corner of the screen and select System Preferences.
2. Choose Screen Time.
3. Click on Content & Privacy on the left sidebar.
4. Click Activate, which is in the top right corner of the window (unless you have already enabled the feature).
5. Select Limit Adult Websites, then click Customize.
6. In the Restricted section, click on the plus icon.
7. Add the desired URL and press OK.
How to block everything and add specific sites to the list:
1. Go to Screen Time via Mac System Preferences.
2. Choose Content & Privacy on the left sidebar.
3. Click on Allowed sites only, then click on Custom.
4. Add the allowed sites and press OK.