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Here is a collection of tips that may help you with productivity.
Keyboard Shortcuts (while most of these are universal, some may depend on the application)
General
Ctrl+S Save
Ctrl+P Print
Windows key
Win+E Open Explorer Window
Win+D Show the Desktop
Win+L Lock the computer
Win+R Run command
Win+M Minimize all (Shift+Win+M to restore)
Alt+Tab Switch to another running program
Alt+F4 Close current program