Firewall for dummies?

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Can someone explain this to me? The correct/wrong way to use it? The purpose of it?

The reason I asked is because me and my brother are on the same internet (mine is wireless, his is via ethernet cable) and when I opened my iTunes it showed his shared folder. Why did it do this?

I don't have anything bad on mine, but I don't want him to be able to delete anything like my artwork files (screen printing), music, etc. I looked around under System Preferences in Sharing.

Also, if we did decide to share music, how could I set it to only allow him to access the music?

Thanks for all the help. I appreciate it. Im trying to learn everything about mac's that I can.
 

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