Knowledge Base Article: Object Metadata and Metadata Card
Metadata is information that describes an object in M-Files. Every object in M-Files has metadata — properties that describe what the object is, who created it, and other relevant details. Metadata helps you to find objects in M-Files.
You can edit the object metadata on the metadata card:

Tip: You can use keyboard shortcuts when you edit object metadata. For more information, see Shortcuts for the metadata card.When Intelligent Metadata Layer and intelligence services are set up, M-Files shows metadata suggestions for a new document:
Click a property to activate the metadata card toolbar. The toolbar is available for properties that use a value list.
To select many objects in the listing area:
Tip: When you edit the permissions of many objects, it is recommended for performance reasons that you do not make other metadata changes at the same time.The metadata card contains important information about the object, such as the title, creation time, author, and class of a document.
Tip: To open the metadata card in a separate window in the classic M-Files Desktop, select an object in the listing area and press Alt + Enter. For more keyboard shortcuts, see Keyboard shortcuts in the classic M-Files Desktop.
Note: Metadata helps you to find objects in M-Files. The more accurately you describe your objects with metadata, the easier it is to find them later.