I am always learning new Mac and PC shortcut keys when I am running trainings. Here are the greatest hits!

and...
remember to CLICK HERE to get more tips and tricks!

PC

  
    WINDOWS + D
    
Go to Desktop

  WINDOWS + left/right arrow 
    
Split Screen

ALT + TAB
Toggle between open windows  

WINDOWS + TAB
View all open windows and Virtual Desktops 

WINDOWS + CTRL + right arrow
      
Go to Virtual Desktop  

WINDOWS + SHIFT + S
Take a screenshot and send it to clipboard  

ALT + CTRL + M
Insert a Comment  

				ALT + CTRL + minus sign
	Insert the Em-dash (the long dash —)  

WINDOWS + . (this is a period)
      
Insert emoji 😍

MAC

  
  ⌘ + TAB 
    
Toggle between windows 

⌘ + W
      
Close window  

⌘ + Q
      
Close  application  

⌘ + OPTION + M
      
Minimize all windows  

⌘ + OPTION + H
      
Hide all windows except Finder  

⌘ + F3
      
Peak at Desktop  

⌘ + SHIFT + 3
      
Screenshot of current screen  

⌘ + SHIFT + 4
      
Take a selective screenshot  

    OPTION + SHIFT + Hyphen
    
Insert the Em-Dash (the long dash —)

⌘ + Space
      
Open Spotlight  

⌘ + OPTION + Space
      
Open Finder