Notes:

Unity - Window menu: commands :

NextWindow (Ctrl+Tab):
PreviousWindow (Ctrl+Shift+Tab):
Layouts:
Services (Ctrl+0):
Scene (Ctrl+1):
Game (Ctrl+2):
Inspector (Ctrl+3):
Hierarchy (Ctrl+4):
Project (Ctrl+5):
Animation (Ctrl+6):
Profiler (Ctrl+7):
Audio Mixer (Ctrl+8):
Asset Store (Ctrl+9):
Version Control:
Collab History:
Animator:
Animator Parameter:
Sprite Packer:
Experimental:
Holographic Emulation:
Test Runner:
Lighting:
Occlussion Culling:
Frame Debugger:
Navigation:
Physics Debugger:
Console (Ctrl+Shift+C):

Window menu commands:

NextWindow (Ctrl+Tab):
allows us to activate the Nextfree floating window

PreviousWindow (Ctrl+Shift+Tab):
allows us to activate the Previousfree floating window

Layouts:
allows us to arrange windows in different predefined layouts.

Docking & Undocking a window:
Click and drag the window name to dock or undock it

Adding & Removing a window:
Click on the context menu icon, which is available at the top right corner of the window

Saving & Deleting a layout:
Adjust the panels according to your requirement, then go to layout dropdown to save or delete the layout.

Revert factory settings...:
Deletes all predefined and user defined layouts and loads predefined layouts with default settings.

Bellow commands allow us to make specific window visible:

Scene (Ctrl+1): User view
Note: allows us to create and edit game scenes.

Game (Ctrl+2): Player view
Note:allows us to see the game scene through one of the scene cameras.

Inspector(Ctrl+3):
Note:allows us to inspect properties of a selected game object or an asset.

Hierarchy (Ctrl+4):
Note:allows us to create and manage game objects of the current scene.

Project (Ctrl+5):
Note: allows us to create, access and manage assets of the project
The folder structure that we see in the project view represents the folder structure in Assets folder of the project.
Note: Never work with the Assets folder outside the Unity IDE.

Console (Ctrl+Shift+C):
Displays information, messages and error logs

Animation (Ctrl+6):
Note: allows us to preview and edit animation clips of an animated game object.

Animator:
Note: allows you to create, view and modify Animator Controller

Animator Parameter:
Note: Allows us to manage animator controller parameters.

Sprite Packer:
Note: Allows us to generate sprite atlas using individual sprites

Audio Mixer (Ctrl+8):
Note: allows you to mix various audio sources, apply effects to them, and perform mastering.

Asset Store (Ctrl+9):
Note: allows us to access and download library of free and commercial Unity assets.

Navigation:
allows us to bake the navigation mesh geometry.

Lighting:
allows us to customize the settings of global illumination of the scene or optimize the quality, speed, etc. it allows contains settings for ambient light, halos, cookies, fog, light map generator etc.

Occlusion Culling:
Occlusion culling is the feature that disables the rendering of objects which are not seen by the camera. In occlusion culling window we get setting for culling objects, bake and visualization

Profiler (Ctrl+7):
Note: allows us to have a look on how our game is performing with respect to memory, CPU & GPU consumption.

Experimental:
allows us to open look dev view.
Note: Allows us to analyze prefabs

Frame Debugger:
allows us to pause the game at specific frame and inspect the frame draw calls etc.

Physics Debugger:
allows us to inspect physics elements in the scene.

Services (Ctrl+0):
Note: Services window allows us to get access to wide variety of Unity services which help you to increase the productivity, manage and analyze game and its audience.

Version Control:
allows us to integrate most common version control tools like Perforce and PlasticSCM.
Note: With version control, it is possible to follow every change to the source, along with information on who made the change, why they made it, and what they changed. This makes it easy to revert back to an earlier version of the code, or to compare differences in versions. It also becomes easier to find out when a bug first occurred, and with what changes might have caused it. Edit - Project Settings - Editor - Version Control - Perforce / PlasticSCM.

Collab History:
allows us to view the entire history of the project and any changes made.

Test Runner:
allows us to test our code in editor mode, play mode as well as on targeted platform.

Holographic Emulation:
allows us to prototype, build and run Microsoft HoloLens projects.