WordPress Plugins Which Automatically Create Links
This would include any plugin that causes text already in your site to link to other pages inside or outside of your site. Some examples include SEO smart links, YARPP, recent posts and broken link checker. each of these plugins is highly recommended, and can be useful to your blog when configured properly.
The best way to use auto linking plugins is in places where the addition of links would not be damaging. A good example would be on blog posts. These informational articles are meant to bring traffic to your site, traffic you hope stays there. In these instances, it is useful and wise to provide plenty of additional content for your visitors to peruse and Chandler website designer best practices tells us there is value in promoting continued engagement on your site.
A bad place where these plugins can cause problems would be landing or conversion pages. These pages are the money pages that convert your visitor to a customer. Your visitor typically got to this page by deciding to Google or click on a link with your main product listed. This person is ready to become a customer, they do not any longer need or want to be sold. To provide links away from this page without good reason is an SEO and sales mistake. It is a very common SEO error that arises from these plugins, though most if properly configured can avoid this.