I am hoping to develop the linux kernel, which version should I modify

[Jimmy Pan]

There is a 3.0 in my hard disk, which I downloaded around Aug 10. There is
3.0.4 and 3.1-rc4 code. Which version should I use. Since I am a newbie, I
think I don't need to use the newest version. Can I use my 3.0 version, or
should I download a new one?
Maybe I can read the kernel source on the web, is there a way to use the
source on web to make patches?
Thanks in advance.
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