And one reason for that is all the nifty little tricks that are scattered throughout the OS — in particular, the productive secrets that are hidden in Finder. And if there’s one Finder trick that you ought to learn, it’s this one: pressing Space.
If you’re a Mac newbie, you’ve probably been making the same mistake that I have: previewing images, videos, music, documents, and all other manner of files by double-clicking on them. That’s how it’s done on Windows, and it works on Mac too, so why not?
But what’s nice about Finder is that you can select a file and press Space to get an instant preview of it without launching any other apps. Why is this useful? Because you don’t waste time or system resources loading up a potentially heavy app (like Photoshop) just to preview a file.