URL changes when moving or renaming content
A URL (Uniform Resource Locator) – also known as a web address or path – is created by the WCMS when content is saved.
...
...
What you need to know about URL changes
If content is renamed (the heading changed) or the parent is changed using the content editing page, the URL of the page will change immediately. If the page has any children, their URL will change the next time they are edited and saved.
...
Immediately resave any items (parents and any children) affected by a menu change or a renaming.
Clear all caches to update any internal links.
Set up redirects for all URL paths that have changed.
...
Redirects
It is always best practice when URLs change to create a redirect from the old URL to the new URL – you never know how many people will have bookmarked the old URL or have links to the old URL in their web pages.
If, after some time has passed (we recommend at least a month), you find that these redirects aren’t being used – your redirect page will tell you this – you can delete the redirects in relative safety.
...
A note about Archiving content
Archived content is removed from the site hierarchy, and any content contained underneath will move one level up. When you archive an item its children will have changed paths the next time they are saved.
...