You can delete content that you do not need anymore. This generally (but not in all cases) moves the content in the trash can, from where it can be restored for predefined amount of time. When that time expires, the content is deleted and cannot be restored any more.

Use Trash can main tab to restore deleted and not expired content.

When you restore content, it may change its name.

 

Use the Table of Contents to find information. See also Using table of contents in help.