Quick little time saving shortcut for today...
You know when you plug your Macbook into your projector and it automatically splits your monitor into two separate screens? Annoying, right?
Unless you're giving a talk with notes in front of you and your audience viewing your presentation, you probably want to mirror your display.
Don't you wish there was just a button you could just click to do that instantaneously without having to go into your computer's display settings?
I give you Command - F1...
Pressing those two buttons together will automatically mirror your display. Pressing it again will switch it back.