Why are there 3 library folders on my MB Pro?

Why are there 3 library folders on my MB Pro? (1) in the HD folder; (2) in the system folder; (3) in the user folder?

Your home/Library folder contains support and preference files for you. It includes all your mail, if you use Apple Mail, as well as things like contacts, calendars, Safari bookmarks and caches, and so on. It also includes any fonts which you have installed for your user. 20GB seems a little high, but if you have a lot of mail/attachments, this could explain it.
The /Library folder contains support files (usually third-party) for all users. Adobe tends to put files in here, for example. It also includes iLife template/loop files, so you'll find GarageBand loops here, for example. Fonts which can be accessed by all users can be found here.
The /System/Library folder belongs to OS X, and contains support files for the system.
Don't delete any files from any of the folders unless you know what you're doing...
Matt

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