World building using Unity
World building with Unity is simple, enjoyable, and you can use the environments you are creating to tell stories and help implement differences on how to play the game as well as it can be informative, creative and serve as a opportunity to show off level designing, lighting and 3D assets that are involved in the making.
Below is a scene that was premade and added into Unity via the unity store, which can be downloaded for free, it is called "nature starter kit". This is also the download that I used the lighting for in my promotional video for my groups mobile device project.
To get started with creating your own level/environment, view the Unity viewport, this viewport shows your location of assets and simulates it in runtime as well as visual effects mostly with lighting.