The QGIS community offers a variety of different community-based support options. These include the following:
- GIS StackExchange: One of the most popular support channels is http://gis.stackexchange.com/. This is a general-purpose GIS question-and-answer site. If you use the tag qgis, you will see all QGIS-related questions and answers at http://gis.stackexchange.com/questions/tagged/qgis.
- Mailing lists: The most important mailing list for user questions is qgis-user. For a full list of available mailing lists and links to sign up to, visit http://www.qgis.org/en/site/getinvolved/mailinglists.html#qgis-mailinglists. To comfortably search for existing mailing list threads, you can use Nabble (http://osgeo-org.1560.x6.nabble.com/Quantum-GIS-User-f4125267.html).
- Chat: A lot of developer communication runs through IRC. There is a #qgis channel on www.freenode.net. You can visit it using, for example, the web interface at http://webchat.freenode.net/?channels=#qgis.
Before contacting community support, it's recommended to take a look at the documentation at http://docs.qgis.org.
If you prefer commercial support, you can find a list of companies that provide support and custom development at http://www.qgis.org/en/site/forusers/commercial_support.html#qgis-commercial-support.
If you find a bug, please report it because the QGIS developers can only fix the bugs that they are aware of. For details on how to report bugs, visit http://www.qgis.org/en/site/getinvolved/development/bugreporting.html.
