Mozilla "Mentor Bugs If you are looking for a bug with guidance, we maintain a set of bugs that are marked with an assigned mentor (see "Whiteboard" field). The mentor will help you get the necessary information to understand the issue, point out relevant parts of the code to look at, etc. You can browse these bugs on Bugs Ahoy!, but here's a list of unassigned mentor bugs to get you started:"
https://wiki.mozilla.org/Mobile/Get_Involved#Mentor_Bugs
Other examples:
#easyfix: https://github.com/facebook/flow/labels/easyfix
#beginner: https://github.com/eslint/eslint/labels/beginner
#exp:beginner https://github.com/docker/docker/issues?q=is%3Aopen+is%3Aiss...