Looping through a folder of files in VBA

Hi, I am super new to VBA macro and teaching myself as I go. I was wondering if someone could help me by posting an outline for running a loop? Specifically, I would like for the VBA macro that I write to apply itself to all of the individual files in a specific folder. Is that possible?

I was planning on writing the actual tasks for it to perform on each file either through "Record Macro" or the tutorials that I have found.

Also, could someone also explain how to operate a loop to begin with? Do all of the workbooks need to be open or what?

Thank you for your help-this project for my class is due in the morning.