i have submitted rss of my site in around 30 sites last week. But this week there I have updated my home page. So should I resubmit the rss in those same 30 sites which I have used last week. IS NECESSARY TO SUBMIT RSS OF SITE AGAIN AND AGAIN IN SAME RSS DIRECTORIES AS WE MAKE CHANGES ON OUR SITE OR ONE TIME RSS SUBMISSION IS ENOUGH
So far i know, you don't need to re-submit your rss again. When you modify your modify your content, it will also make change in the rss feed.