Galleries and collections can be associated with a series of actions to automate your workflow.
In the collection’s or gallery's More / Automation settings, you can choose to automatically import images to the collection based on their metadata.
For example, you can create a collection named "Landscapes", and use the Automatically import feature so that all images that match the keyword search "landscape" will be assigned to the collection.
Matching for images and videos occurs in the very same way as for the internal search in your library. Refer to the help on the internal search for more details!
Note: By default, Images are checked for automatic import upon upload or keyword changes. Check the box Rescan whole library and import matching images to check at once all images in your media library against the keyword search criteria.
The following example automatically completes keywords and location metadata for images matching the search criteria "Manhattan", and publishes them to dedicated gallery: