The Content area in D2L is the primary place to add files and other learning materials and share them with students. It can also be used to organize all the course activities.
Yes. Topics or even whole modules can be restricted in the Content area by setting their status to "hidden" or limiting their availability by date. For more information, view Setting Dates and Availability.
Files can be added to the Content area of a course site through the Upload Files option. For instructions, view Uploading Files.
Modules and topics can be reordered simply by dragging and dropping them into new locations in the Content area. For more information, view Reordering Modules and Topics.