Win + EOpen File Manager
Win + MMinimize all windows
Win + LLock your PCย 
Alt + TabToggle between current running programs
Win + .Emoji Keyboard
Ctrl + ASelect All
Ctrl + ZUndoย 
Ctrl + YRedo
Ctrl + DDelete all the selected items
Win + PrtScnTake a Screenshot

Lemme know if you need more Hot Keys : )