This question already has an answer here:

How can I hide the /node page in Drupal 8?

This site: https://www.drupalaid.com/blog/3-things-you-should-hide describes the reasons for hiding it and the process for Drupal 6 and 7, though no information for Drupal 8 now hook_menu_alter() has been removed.

marked as duplicate by Clive Apr 26 '16 at 15:48

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