All pages and modules within pages have an item ID to identify them
The item ID for a page/module will appear here in Sitecore:
If you are looking to find an item ID for a page that you only have a URL for, you can do this by:
Opening up the selected page in your browser
Right-click anywhere on the page > View page source (CTRL+U)
Following this, the HTML code of the page will open in a new tab like so:
Scroll down the HTML code until you find
<!--ZetaHub MetaData-->
Or, alternatively, press CTRL+F and search for zetahub or itemID
The item ID can be found here and you must only copy up until before the hyphen and country code i.e. f6b5e825-b4bb-44a7-82fb-147d1a8c599c and not f6b5e825-b4bb-44a7-82fb-147d1a8c599c-en-US
You can then paste this item ID into the Sitecore search box and it will bring you directly to the page
You cannot search for specific modules using an item ID from a URL, only the parent item of the page can be searched