The Titan community home can be found at titan-data.io. There you can find a getting started guide as well as documentation.
To connect with members of the community, head over to the community page where you can join the slack workspace. There, you can ask questions and get help. If you're not sure whether something is a bug or not, be sure to ask there first.
If you're sure that something is a bug or feature request, you can submit an issue that will then become the point of further collaboration. Be sure to watch issues and respond if there are any follow-up questions.