Here are the steps to add sharing buttons on Drupal 8:
1. Install and enable the “AddToAny Share Buttons” module. Navigate to the Extend page and search for the module. Install and enable it.
1. Configure the module. Navigate to the configuration page of the “AddToAny Share Buttons” module. You will see options to configure the sharing buttons such as where to display the buttons and which buttons to show.
1. Add the sharing buttons block to a region. Navigate to the Block layout page and add the “AddToAny Share Buttons” block to a region of your choice.
1. Save the changes. Once you have configured the module and added the block to the region, save the changes.
1. Test the sharing buttons. Visit your website and test the sharing buttons to ensure they are working correctly.
That’s it! You have successfully added sharing buttons to your Drupal 8 website using the “AddToAny Share Buttons” module.