In many cases the [[http://dev.mysql.com/doc/|documentation for MySQL]] can be
used. New features of MariaDB are mentioned on the
[[mariadb-versus-mysql|MariaDB versus MySQL]]
page and in greater detail here on AskMonty.org in the [[MariaDB]] category.
If it's a question about a feature that is not properly documented or something that is not working as expected, go to the corresponding [[MariaDB|knowledge base page]] and ask your question there.
You can report and check on bugs which are unique to MariaDB in
[[http://bugs.launchpad.net/maria|Launchpad]]. MySQL bugs that also affect
MariaDB should be [[http://bugs.mysql.com/|reported to MySQL]].
You can also subscribe to the [[where-are-other-users-and-developers-of-mariadb|mailing lists]] and or join the [[IRC]] channel to communicate with other MariaDB users.
[[http://montyprogram.com|Monty Program Ab]] offers [[http://montyprogram.com/support|commercial support]] for MariaDB and all major MySQL versions (starting from MySQL 3.23) through a worldwide network of providers.