• Win+X U U Shutdown
• Win+L Lock
• Win+V Clipboard history (might need to be enabled but * very useful)
• Win+Tab Visual alt tab
• Win+D Show desktop
• Win+S Screen snipping tool (for partial screenshot)
• Win and start typing for search
• Win+1-9 switch between windows (works well if your apps are pinned to taskbar in specific order)

Use all of these and more

Mathematician 2 kinda blew my mind, kinda obvious, just can’t believe I was never taught or thought about it.