FYI: As all the new Trac changes are also on bbPress & BuddyPress Tracs, the “good-first-bug” tag is also available, we'll try to remember to add it and leave a few hanging around for new contributors.

https://bbpress.trac.wordpress.org/query?status=!closed&keywords=~good-first-bug
https://buddypress.trac.wordpress.org/query?status=!closed&keywords=~good-first-bug