Have 3 System Libraries, Can I Delete Any Of Them?

[Flight3]

I am running out of space on my powerbook g4, and noticed that the libraries take up most of the space (other than my media). I have one library folder, Macintosh/Library, also one under Macintosh/System/Library, and lastly one under Macintosh/Users/(My user name)/Library. That seems like it's a little much, but I don't know, maybe I do need it. Is there a way to delete any of them, or maybe I can use an external hard drive along with my powerbook. I have a 500GB MyBook external hard drive, with a usb plug-in. Can I use that to use applications from and stuff like that? I don't know what I should do.

 

[Sky Blue]

You need those library folders and should not remove them.

 

[Flight3]

You need those library folders and should not remove them.

Dang, is there anyway to clean them up or something, aren't some just like caches that can be deleted overtime or something? Thanks for replying, by the way.

 

[Doctor Q]

You may have a lot of unneeded printer drivers and foreign language files, so you could look into removing them.

Here and here are forum threads about these topics from past years.