Renewing Frequency

Is it necessary to update my sitemap frequently? For example, if I create new pages on my site every day, should I resubmit my sitemap every day too? I don't use google's automatic service.

 

I think u should submit sitemap once a week. My friend tell to me that..

 

i resubmit my sitemap every time my website has new content added (every other day or so)

 

If you have changes update the sitemap, as simple as that. You can do it more than once a day. Try to match it to the same frequency the Google bot is visiting your site if you have lots of changes.