Hi Aaron,
Feel free to help out in whatever way you see fit... including opening PRs! Most of the PR backlog is fairly old and needs to be dealt with still, but they are all stalled for various reasons. We have been able to handle the testing and merging of recent PRs relatively well.
Issues labelled 'beginner' are good choices to start with... I will try to find some more appropriate issues for that label. Otherwise, feel free to take a stab at whatever interests you. Even testing open PRs and adding documentation is quite helpful right now.
If you end up having any questions, feel free to reach out! Our Gitter is a good location to pose various questions you may come across. Additionally, if you find any areas where you feel documentation would be particularly helpful then please point them out as well.
Thanks,
Scott