offset question

[dgoody88]

sorry if this has been talked about and talked about but im really confused on understanding offset. ive tried searching but its not helping. im lookin into buying some diamond racing steel wheels and I don't really understand what I need to get for the offset all of it they list is negative offset. maybe someone can clear me up on the whole offset thing. any input would be appreciated

[dgoody88]

nm think I found what I was looking for after I posted this.