Q: What is the difference between two "Library" Folders?

I have two Library folders on my system, one in the "System" folder, the other a stand-alone folder with an icon on it in the open HD next to the "System" folder.
What is the difference between these two Library directories??? I have some files in each that are duplicates.
What should actually be inside each folder? I have had many crashes and it may be due to this duplication of software files fooling the system (?).
Please help...Thanks in Advance,
Diane

Actually, you have three Library folders:
/System/Library/
/Library/
/Home/Library/
There is no "duplication" of files although there are similar folders in each. Each Library folder belongs to a user hierarchy.
/Home/Library/ folders belong to each "standard" user on the computer. Each user has a /Home/Library/ folder. Standard users can only access their Library folder and no others.
Some users are "admin" users. Admin users can access the /Library/ folder and some user folders, but not user data.
Last is the System Administrator. The Sys Admin can access the /System/Library/ folder and any other folder on the computer. Also sometimes referred to as the "root" user or "super user."
WARNING: Do not mess around in these folders. The only folders in which you may have need to access are in the /Home/Library/ folder. These would include Preferences, Preference Panes, Contextual Menus, and Applications Support.
If you are having crashing problems it could be due to any number of things. Visit The XLab FAQs and read the FAQs on troubleshooting OS X.

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