My tip:
System Preferences -> Desktop & Screen Saver -> Screen Saver -> Hot Corners -> Bottom Left Corner (or whichever you prefer) -> Put Display To Sleep (or Lock Screen if you prefer).
System Preferences -> Desktop & Screen Saver -> Screen Saver -> Hot Corners -> Bottom Left Corner (or whichever you prefer) -> Put Display To Sleep (or Lock Screen if you prefer).
(seriously, this is a game changer for me, thanks!)
Adding caveat : Keep the dock size small to avoid interfering with Hot Corners and if you use VM in seamless mode try not to place any action(VM guest panel) near the macOS Hot Corners.
I use the bottom right corner for revealing the desktop. Extra handy while dragging files.