Unpublishing content is a great way for managing your content that will allow you to keep it for a later date and if you'd like to Delete it permanently - here's how!
Unpublishing
Unpublishing content means it will be moved back into Draft status for you to republish or duplicate later
Navigate to the Studio
Use a filter to sort it by Date/Author/Publish Status or use the Searchbar
Once you've found your Content, select the 3-dots menu
Select "Unpublish" from the drop-down menu, and your Content will be Unpublished!

Deleting
Deleting content means it will be permanently removed from the learning platform.
Navigate to the Studio
Use a filter to sort it by Date/Author/Publish Status or use the Searchbar
Once you've found your Content, select the 3-dots menu
Select Delete from the drop-down menu, and a popup will appear
Type Delete to confirm and it will be deleted

Here's a quick video guide: