Here is a list of 12 most useful Windows 10 keyboard shortcuts.
Start Cortana
Keyboard Shortcut: WinKey + S
Start Cortana Voice
Keyboard Shortcut: WinKey + C
TaskView Mode
Keyboard Shortcut: WinKey + Tab
Switch between Windows
Keyboard Shortcut: Alt + Tab
Windows Snapping
Keyboard Shortcut: WinKey + Up/Down/Righ/Left
Show Desktop
Keyboard Shortcut: WinKey + D

Keyboard Shortcut: WinKey + A
Open the Settings Menu
Keyboard Shortcut: WinKey + I
Open the Start Button Context Menu
Keyboard Shortcut: WinKey + X
Close a window
Keyboard Shortcut: Alt + F4
Open Windows Run
Keyboard Shortcut: WinKey + R
Log off or Switch Users
Keyboard Shortcut: WinKey + L