Post titles and urls are important for the SEO of your site and having duplicates can have a negative effect. We have helped many users and will tell you how we would prevent duplicate post titles.
Text version of this tutorial:
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Summary of this tutorial:
Start by going under Plugins, Add New and add the Unique Title Checker plugin:
There are no settings to configure in this and it will prevent duplicate titles out of the box.
When you add a new post that has the same name as another on your site a warning will pop up saying that another post has the same title.