Our site currently sucks, and we're talking about either moving to Wordpress or making a new site. I've basically finished a prototype, but my collegues told me that WP is often better for SEO. I did a little research and found that Wordpress just has better defaults, and useful tools. I thought I could easily replicate everything by myself (and not mess around with someone else's blog skins), but couldn't find what exactly is needed - Google's webmaster guidelines don't provide any concrete information about meta tags, etc. What do Wordpress plugins actually do?
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Wordpress per say isnt better for SEO than any other platform. Some one could make a wp theme that was horrible SEO wise, just because your on wp isnt going to help.
Whats great about word press and this is more for onsite SEO than offsite is its flexibility, and the ease of editing it. This is were plugins help big time.
For instance its url structures by default are set up nicely- ie. mysite.com/mypage instead of mysite.com/auth/ben/123/mypage
You want to add a robots.txt file - easy just download a plugin for it and configure a few easy drop downs and your done.
www. vs non www redirect - again easy, i think its done as default, but if not again plugins, similarly with mysite.com vs mysite.com/index.php
The best SEO tool that will help you configure Title tags aswell as other bits a peices is by Yoast