Focus is really good at blocking websites.
After that, just add the specific websites you want to keep using.
First, click on the Focus icon at the top of your screen, then click the gear icon that appears in the window.
Next, pick the Websites option from the list and select Allow these websites.
With this setting turned on, Focus will block all websites except the ones you've added.
To learn more about how Wildcards and Exceptions work, read advanced website blocking.
Now that you know all the ways to block websites, learn how to use Focus with other apps to make your work flow smoothly.