My most used Windows shortcuts (I use Windows 8.1)

File explorer

• To start a new app -> Windows key + Start typing the name of the app

• Open This PC/File explorer -> Windows + E
• Open a new window -> Ctrl + N
• Close the active item/window -> Alt + F4 or Ctrl+W
• Switch between active windows -> Windows key + Alt

• To minimize the active window -> Windows key + Down arrow
• To maximize the active window -> Windows key + Up arrow
• Fix the active window left to the screen -> Windows key + Left arrow
• Fix the active window right to the screen -> Windows key + Right arrow

File/Folder

• Create a new folder -> Ctrl + Shift + N
• Renaming a selected item -> F2
• Open the Properties dialog box for the selected item -> Alt + Enter     
• Cut any file/folder -> Ctrl + X
• Copy any file/folder -> Ctrl + V
• Paste any file/folder -> Ctrl + C

• View the next folder -> Alt + Right arrow  
• View the folder that the folder was in -> Alt + Up arrow  
• View the previous folder -> Alt + Left arrow or BackSpace 

Microsoft word

• Save the current file -> Ctrl + S
• Increase the font size -> Ctrl + ]
• Decrease the font size -> Ctrl + [

Move the cursor to

• The beginning of the next word -> Ctrl + Right arrow
• The beginning of the previous word -> Ctrl + Left arrow
• The beginning of the next paragraph -> Ctrl + Down arrow
• The beginning of the previous paragraph -> Ctrl + Up arrow
• Select a block of text -> Ctrl + Shift with an arrow key

Print Screen

• Take the whole screen sort -> Press PrtScr button then Paste the image
• Take a screen sort of the active window -> PrtScr + Alt then Paste the image
• Whole screen sort and save it to the picture folder -> Windows key + PrtScr

Browser (Chrome)

• Create new tab -> Ctrl + T
• Close the active tab -> Ctrl + W
• Switch between the tabs -> Ctrl + Tab
• Go backward -> Alt + Left arrow
• Go forward -> Alt + Right arrow
• Open the link to a new tab -> Ctrl + Click on the link
• Open the link to a new window -> Shift + Click on the link
• Zoom in -> Ctrl + +
• Zoom out -> Ctrl + -
• Full Screen -> F11

Miscellaneous

• Lock the pc -> Windows key + L
• Display or hide the desktop -> Windows key + D
• Task Manager -> Ctrl + Shift + Esc

I've learnt these from here. Thank you.