Common Words like a, an, the, and, to etc. should be removed from the urls in order to make them friendly for search engines. These words weaken your SEO. Many bloggers ignore this fact but it is something that should be taken care of. You can do this manually. When you write a post, edit its url by removing such words. You can also refer a plugin for this – SEO Slugs Wordpress plugin. This plugin automatically removes such words from your link when you publish the post.

Here, one question arises?
If the plugin will remove the words from older posts, it would be a great panic.
Don’t worry, it depends on you whether you want to enable it for your older posts as well. By default, older posts urls will remain unaffected.

Installation:*Download the SEO Slugs Plugin
*Install the plugin.
*Activate it via Wordpress Dashboard.

Download SEO Slugs Plugin