I would like to do so more. I have contributed small things like small bug fixes or documentation fixes, but these have been very minor (basically fixes I could make directly in the GitHub web interface). Definitely have filed issues, and I always try to do due diligence and provide a lot of info in the issues I have filed.

There are two ways I could see contributing more. One is by creating some libraries that would hopefully be used by others. This is something I'm definitely trying to push myself to do, which includes gaining some confidence of just getting something out there. The other way is to contribute to existing projects, but I have personally found this difficult. Code bases are often extremely complex, and I personally just don't understand how some people are able to dive into foreign code bases and be productive. It's possible I'm not smart enough, but the other excuse is that there's often a lot of documentation missing or nonexistent and it's tough to get some mentoring on things since everyone else contributing is already so busy.