Update collection.md (#1842)

Added links, removed redundant text, reworded sentences for clarity

docs/concepts/collection.md

@@ -1,37 +1,30 @@
 # Collections
 
-Collections are groups of related content that can be viewed or managed as a unit.  Islandora-specific use cases include:
+Collections are groups of related content that can be viewed or managed as a unit. Islandora-specific use cases include:
 
 - an archival fonds that needs to be grouped together, with internal hierarchy
 - various collections of artifacts, grouped for display
 - theses and dissertations, which are organized and managed separately from other objects.
 
 Islandora provides:
 
-- a field storage called "Member of" (field_member_of) that can be used to declare items to be members of other resources.
-- a "Children" tab on resources, which provides a management interface to access, re-order, add, or delete the members of a resource. 
+- a generic "member of" relationship field (field_member_of) to group objects under a "parent" object. This mechanism is shared by _Collections_ with similar use cases: [Paged Content](../user-documentation/paged-content.md) and _Compound Objects_. Islandora on its own does not prescribe any particular [Content Type](../user-documentation/content_types.md), so this field can be configured for any [node bundle](https://www.drupal.org/docs/drupal-apis/entity-api/bundles) intended to represent Islandora resources.
+- a "Children" tab on resources, which provides a management interface to access, re-order, add, or delete the members of a resource.
 
-Islandora on its own does not prescribe any particular content types, so this field storage can be implemented on any node bundle inteneded to represent Islandora resources. Islandora provides a generic "member of" relationship field to group objects under a "parent" object. This mechanism is shared by similar use cases: Paged Content and Compound Objects.
+## Collection configuration provided by Islandora Defaults
 
-## Bulk management of members of a collection
-
-Bulk management of items can be done using the Drupal contrib module [Views Bulk Edit Drupal module](https://www.drupal.org/project/views_bulk_edit). In short, build a view using this views field, and you will be able to perform Drupal Actions on objects. Neither Islandora nor Islandora Defaults provide out-of-the-box management tools, but the sandbox provides some sample content and views that use Views Bulk Edit. 
-
-For more information see [forthcoming page] Concept: Bulk Edit
+[Islandora Defaults](../reference/islandora_defaults_reference.md) is an optional collection of presets for Islandora, intended to provide a more user-friendly out-of-the-box experience and starting point for more specific customization. Islandora Defaults provides:
 
-## Configuration provided by Islandora Defaults
+- a [Content Types](../user-documentation/content_types.md) "Repository Item" that uses the "member_of" field, so that users may add nodes of this type to a collection (or paged content, or compound resource),
+- logic (a [Context](../user-documentation/context.md)) such that if a resource is tagged as a "collection", a view of its members will show on the collection's page. 
 
-Islandora (Defaults) provides:
+For more details, see the tutorial on [How to create and add to a collection](../tutorials/how-to-create-collection.md)
 
-- a content type ("Repository Item") that has the "member_of" field, so that users may add nodes of this type to a collection (or paged content, or compound resource),
-- logic (a context) such that if a resource is tagged as a "collection", a view of its members will show on the collection's page. 
-
-For more details, see the tutorial on  [How to create and add to a collection](../tutorials/how-to-create-collection.md)
-
-## Tutorials
+## Bulk management of members of a collection
 
-- [How to create and add to a collection](../tutorials/how-to-create-collection.md)
+Bulk management of items can be done using the Drupal contrib module [Views Bulk Edit](https://www.drupal.org/project/views_bulk_edit). In short, build a view using this module, and you will be able to perform Drupal Actions on sets of objects. Neither Islandora nor Islandora Defaults provide out-of-the-box management tools, but the sandbox provides some sample content and views that use Views Bulk Edit. 
 
+For more information see the video tutorial on [Batch Editing](https://youtu.be/ZMp0lPelOZw).