Shortcut for dialog boxes!
When a dialog box pops up in applications such as Safari, the shortcut is usually pretty obvious. "Enter" will be "OK" and "Esc" will be "Cancel". But, it does happen that some dialog boxes don't have the obvious OK and Cancel. One that annoys me in particular is the one to remember my password. I nearly always want to click "Not Now", but there is no obvious way of doing that. Even for that, the Esc shortcut works. In this case, there are three options, so you'll have to try it once to see which option will "Esc" do for different dialog boxes. It didn't make sense to me at first, because I always see Esc as a way of stopping a web page from loading, but it is really useful when you start using it.