Just a little tip for mastering an application’s menus and shortcuts, and with no need for Yahoo! or Google searching either.
Use the Help ▸ Search menu item (available in all but the most broken or abandoned applications). It even has its own shortcut:
⇧⌘/
So in Finder, hit that shortcut then type what you’re looking for, and the results include those that are hidden behind keyboard modifiers too. As you can see, it even suggest help topics (although I rarely find those useful).
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There are applications that build on top of this, for example
KeyCue ‘Keyboard shortcuts on Cue’. And
CheatSheet ‘Know your short cuts’, but I haven’t used these much to be able to recommend either.
And if you were meaning to minimize all active windows in all open applications, there isn’t anything that does exactly that, but there’s the
Show Desktop command. You can find and adjust the Show Desktop shortcut in System Preferences ▸ Mission Control ▸ Show Desktop (often set to F11).