Unity 2D/3D game development

As I am new to game development , I am finding it very difficult to search for resources to learn Unity. I work on Android OS, I have pretty good knowledge of Android Application development. But I really don’t know how this works! Do I have to search for Unity game development aimed for android? Because all the books and video tutorials I have found say nothing about the platform for which the game is being built. I know it sounds pretty dumb , but I am a newbie in this area , so I am finding it really very difficult!

With Unity, development for any of the platforms it supports is for the most part all the same. There are a few platform specific elements when it comes to publishing, but generally building is all the same.