The parameter settings are completely optional, and are only useful when you need to pass some Moodle information to the resource file or web site.
If you define any parameters they will be passed to the resource as part of the URL (using the GET method).
The right column allows you to choose information to send, and the left column allows you to give it a name.
Note that the user information will be from the user who is looking at this resource, and the course information is from the course that this resource is part of.