Quick commands for Windows users:

Win + I - Opens the Window Settings.
Win + S - Opens the Windoës option where you can search for something.
Win + M - Minimizes all windows.
Win + comma - Runs immediately on desktop.
Win + Prt Scn - Creates a screenshot and saves it to the Screenshots folder.
Shift + Win + S - Selects a part of the desktop and saves it as a view.
Win + "-" / "+" - Minimizes or enlarges.
Ctrl + A - Selects all text.

Quick commands for Microsoft Word users:

Ctrl + N - Creates a new document.
Ctrl + O - Opens an existing document.
F1 - Opens the Help option.
F7 - Open Editor Tool to correct spelling and grammar.
Ctrl + Shift + left / right arrows - Selects a word to the left or right.
Ctrl + Shift + ?<? or ?>? - changes the font size.
Ctrl + C - Copies the text.
Ctrl + V - Insert previously copied text (paste).
Ctrl + Shift + K - Returns lowercase letters.
Ctrl + K - Overlaps a link.
Ctrl + 5 - Sets the writing space 1.5.
Ctrl + N - Returns the paragraph to normal style.
Alt + Ctrl + 1/2/3 / - Set Heading 1, Heading 2, Heading 3.

Quick commands for Mac users:

Command + Tab - Goes to the last window used by the open windows.
Control + Command + Q - Closes the screen.
Shift + Command + Q - Log out of your macOS account.
Shift + Comman + I - Open iCloud Drive.
Shift + Command + N - Creates a new folder.
Shift + Command + O - Opens the Documents folder.
Option + Command + L - Opens the Downloads folder.

Quick commands for Mac when working on a document:

Command + K - Overlaps a link.
Command + T - Show or remove Fonts window.
Command + F - Opens the search option.
Command + C - Copies the text.
Command + V - Insert duplicate text.
Shift + Command + "-" - Decreases the size of something selected.
Shift + Command + ?+? - Increases the size of something selected.