well im new to this forum and i heard stuff about jail breaking i was just wondering

1.What is it.

2. Will it take memory if so how much.

3. Will i still have the app store. (the one it came with)

4. I have version 3.0 itouch if i jail break will i still have the 3.0 stuff like copy and paste or search thing.

5. Is there a way every thing could go wrong and break my itouch


thanks,
gus 524

any one plz