Unity has had an amazing community for years, creating thousands of hours of tutorials and support topics on how to use Unity and its tools. You can learn or ask anything you want through the Unity answers forum.

Unity answers are available at http://answers.unity3d.com/.

Unity also offers a lot of tutorials for all sorts of different game types and platforms. If you want to look up anything that the Unity engine can do, refer to the documentation section of Unity's website.

Unity tutorials are available at http://docs.unity3d.com/Manual/index.html.