DP itself is a very helpful forum for all your webdesign queries...then you can google it... Regarding SEO...there are lots of SEO related sites..am sure u can find some suitable to your needs...
this is a great forum that a lot of webmasters use, there are a few others I visit, but I don't feel it's fair to mention them here. As far as SEO help, you can learn a lot by visiting some related blogs, try SEOBook they're highly respected.
Digital Point Forum is a great forum for webmaster. Good SEO takes time, as you need to develop great content and a strong community voice. But this is just what the Internet needs: high-quality pages that provide a valuable service to users.