Getting Started With Unity / Tutorial 02 - The Unity Editor

The default layout of Unity starts with 5 windows:
On top of your editor you’ll find the toolbar with play controls (play, pause, and play frame-by-frame).

The toolbar also contains:
The windows layouts can be customized but the default settings are recommended for the beginners.

Once you develop your own building habits you can switch to another layout view.

A 2D platform game layout may look different than a first person shooter 3D game.

The default layout on a Windows PC: