When you look at a site's Resources, within the Resources window you will see the Title, Size, author ("Created By"), and Last Modified date.
If you have sufficient permissions, you can click
revise a Resource item, at which time you can also see Creation Time
and Last Modified By metadata.
To view a Resource folder's subfolders, click the arrow icon to the left of the Resource title. You can toggle this arrow open (pointing down; displays subfolders) and closed (pointing right; doesn't display subfolders).