Best Practice: files that should never be moved or deleted

Hi there.
I've just gone through my computer for the first time in a couple of years and done a massive cleanup, but without really knowing the consequences I guess you could say and now things are acting a little strange.
+(I feel silly even writing this, knowing that all the IT heads out there are sighing a unanimous 'what an idiot'.)+
Can anyone please provide a sort of 'best practice' guide for the files/file types that should absolutely be on the harddrive, or in the apps folder, utilities folder, etc? and if there are any that should 'never' be deleted?
.. or even some program that sort of saves you from yourself by keeping those files safe from being a.) moved and b.) deleted
Would be a huge help!
Thanks in advance ~
Message was edited by: BluesySue
Message was edited by: BluesySue

Apple has already hidden about half of the folders on a typical OS X install. The ones that make up the Unix core of the OS. So unless you know how to find those, you'll never have to worry about them.
Aside from that, you just want to keep away from the System folder and any of the Library folders. Nothing else should be too crucial to the OS running.
Of course if you wanted to elaborate on "a little strange" we might be able to be a bit more helpful.

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Best Practice: files that should never be moved or deleted

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