We all like to think we're pretty savvy when it comes to using our Macs, and in the case of the typical Macworld reader, that's usually true. But there's a funny thing we've noticed when we talk even to veteran Mac users: There's almost always some essential stuff—basic things that would make their Mac use easier or more efficient—that they've either forgotten or never learned.So we got some Macworld editors and contributors together and asked: What are the things that every Mac user should know how to do? Not the really basic stuff—Command-C, Command-V, and so on—but the skills and knowledge that mark you as Mac-literate. After much pondering and discussion, we came up with a list of 100 items that fit the bill. Those skills run the gamut from startup to shutdown: they include smart ways to manage files and accounts, search, and customize your Mac. We'll bet that you already know many of them. But we'll also bet that you don't know them all. And if you can really, honestly say that you knew every one, you're a whole lot savvier than any of us.