This section is your key to getting started with Unity. It will explain the Unity interface, menu items, using assets, creating scenes, and publishing builds.
When you are finished reading this section, you will understand how Unity works, how to use it effectively, and the steps to put a basic game together.
Is something described here not working as you expect it to? It might be a Known Issue. Please check with the Issue Tracker at issuetracker.unity3d.com.