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I agree, newbies should be taught to use Minimize as the easiest method to get something "out of the way" – though in many cases, closing something really doesn't cause trouble, as the app will "re-spawn" it as needed (like the Mail Viewer window), or if a fast computer, re-open the app (like Calculator) with no real lag.

But perhaps an even more important lesson for some newbies may be: Don't worry so much about getting things out of the way! Want to switch from Mail to Safari? Don't worry about minimizing, closing, or hiding Safari, or moving its windows around to reveal the Mail windows buried beneath. Just go to Mail – via Dock, or Command+Tab, or Exposé, or just clicking on any visible part of a Mail window – and start using!