Learning by Doing with Unity Docs: http://docs.unity3d.com/Manual/index.html, It's easily as good as C# and way easier to use.

You might want to take a look into the official tutorials from Unity 3D:

https://unity3d.com/learn/tutorials

They also have live-training sessions:

https://unity3d.com/learn/live-training

This is probably the best place to start. Notice that making 2D development or 3D has some differences  so choose wisely what tutorials you should take.

If you have a preferable genre you'll probably want to explore the Youtube a bit for more specific tutorial. Also you might want to check out Unity extensions (and there's plenty out there) to simplify the task of making games for a specific genre. For example:

http://fungusgames.com/