Fedora uses https://bugzilla.redhat.com[Red Hat Bugzilla] for bug tracking. This page and the other pages under the "Bugs" header on the left offer some tips and guidance.
Once you have created an account on Bugzilla, you can also login using your link:https://accounts.fedoraproject.org[Fedora account].
To use your FAS account to login to Bugzilla, you need to either use the same e-mail address on FAS and on Bugzilla, or if they differ, you can set the Bugzilla e-mail address in your FAS profile explicitly.
Bugs marked as xref:bugzilla/find-duplicates.adoc[duplicate] will automatically get a comment referring to the other bug report. The other bug report will automatically get a comment indicating that another bug has been marked as a duplicate of it.
https://bodhi.fedoraproject.org[Bodhi] — the Fedora updates system — will automatically comment and change the xref:#_status[status] of associated bugs as updates move through the system.