RQM General Question Doubt

When you associate RQM project area with RTC(CCM) project area, it will allow you to create defect or quality management task work items in RTC project from within RQM's artifacts such as test plan, test case and test script and so on. In this case, you would want to set Uses-Defects, Uses-Quality Management Task and select the target RTC project area. So using  "Uses-Defects, Uses-Quality Management Task" association will set the target RTC project areas on which you can create the defect and task workitems.
Once these are set, you can see under Associations > Use section, there are entries of target RTC project areas.
This setting is actually creating a backlink. If you go to target RTC project area's admin page, you can see the it will now have the entry under Associations > Provide section(it means RTC provides the defect and task to the RQM project area).
Obviously, Provide-Change sets, Provide-Related Change Requests will focus on the source. That's the RQM project area will be the source to provide the changesets etc to the target RTC project area(when you select these option, in the dialog's preview, it has clear message there), which in general does not make much sense though in latest version as changeset will normally not be provided by RQM project areas.

If you create a lifecycle project areas such as JKEBanking project areas, then go to RTC, RQM and RRC admin pages, you will see how the tool automatically create the associations for you and it will make more sense to understand how it may work among the project areas.