There are several ways you can find answers to your Mautic questions. But it's important to use the right channel for the question you have. Below are two different areas in the Mautic community that can help you.
Please remember that in general, the support offered in both the forums and on Github is provided by volunteers, in their own free time. Please be respectful of this, and consider giving back as much, if not more, than you take from the community.
If you have any kind of support question relating to the Open Source version of Mautic, or have a topic that you imagine might be helpful for others in the future, the forums are a great place to start. Here you can review questions that have been asked as well as post your own. Also, if you have a great idea for a new feature in Mautic this is also the first place to go.
Chat (Slack) - not for Support!
In the Mautic community we are also heavily using Slack, which serves our chat system.
Please note that this is for day-to-day communication, but not for Support (or anything else that may be of interest in the future)!
If you believe you've found a bug in Mautic (and you have already searched the forums to check whether other people have reported the same problem) then the issue tracker is the best place to post your question or problem.