Open SSH ?

Just for practise and learning. Ok so I have installed Open SSH on my iPhone 3G and Cyberduck on my Mac.

I logged into the phone through Terminal but I don't really know how to utilise Terminal so I quit that and Opened Cyberduck.
Logged into the phone easy peasy had a look around.

My question is what is the benefit of this to me ? What is the benefit of Having a browse through the phones structure with Cyberduck. What sort of stuff can I do ?
Can I change SMS sounds ?