The Sweet Setup just posted an article on Hot Corners, a feature of macOS where you can shove your mouse cursor into a corner of the screen to make something happen. I use this to lock my screen or to start the screensaver, but it's easy to trigger accidentally. No more, thanks to a hot tip in their article. If you hold a modifier key (command, option, etc) while selecting the action you want, it will require that key to be down to trigger the corner. I had no idea about this, but I'm trying it now.