how to make quality content of website for seo purpose, please share some valuable tips, is there any tools ?

how much importance of content in a website ????

How we use Google plus in seo ???Is it helpful in Seo???

High quality backlink is the type of back link which is recognize by Google. You can also consider the high quality back link as a page rank, IP, Indexing Time, and many more Process. Have you much more kindly share the details of back link and how to generate high quality back link for website.

I am just eager to know that which social networking sites is sending you guys the most traffic?? Please share your experience.

How can i find keywords for my site which can give actually conversion??

Here is a list of top Blogging Communities
<!-- m --><a class="postlink" href="http://blogengage.com/">http://blogengage.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://blokube.com/">http://blokube.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.bizsugar.com/">http://www.bizsugar.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.bloggers.com/">http://www.bloggers.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://blogster.com">http://blogster.com</a><!-- m -->
<!-- m --><a class="postlink" href="http://dosplash.com/">http://dosplash.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.fuelmyblog.com/">http://www.fuelmyblog.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.gather.com/">http://www.gather.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.indiblogger.in/">http://www.indiblogger.in/</a><!-- m -->
<!-- m --><a class="postlink" href="http://inbound.org/">http://inbound.org/</a><!-- m -->
<!-- m --><a class="postlink" href="http://klinkk.com/">http://klinkk.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://kingged.com/">http://kingged.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://list.ly/">http://list.ly/</a><!-- m -->
<!-- m --><a class="postlink" href="http://managewp.org/">http://managewp.org/</a><!-- m -->
<!-- m --><a class="postlink" href="http://triberr.com/">http://triberr.com/</a><!-- m -->

Twitter is making direct messages for user friendly. The DM's will be more consistent across web and mobile.

I was just wondering that i see some bloggers who writes a blog one or two every day for their blogs and still got many ideas for guest posts too. How they get time and idea to do all of it.

Currently, in my google webmasters tool i am getting too many messages for 404 errors. When i tried to find out that which pages the google crawler is having problem to crawl, i see that the pages don't even exist. What should i do?? Does it going hurt my Google rankings??