Hi,
The meanings of fields in some forms in the UI are usually described in the context help (when you click the green question mark icon on the upper right hand side).
These fields are used to specify custom forms (new document, edit document etc. of given type):
New page: URL of the page that will be used for creating new documents of this type.
Editing page: URL of the editing page that will be used when the document is displayed in the editing mode, using the Page tab.
Editing form: URL of the editing page that will be used when the document is displayed in the editing mode, using the Form tab.
Preview page: URL of the editing page that will be used when the document is displayed in the preview mode.
List page: URL of the editing page that will be used when the document is displayed in the list mode.
Moreover, in newer version you can also use
automatically used alternative forms.
Best regards,
Juraj Ondrus