Check this article to find SEO plugins for WordPress sites, some of these plugins will help you to manage day-to-day SEO issues effectively.. If you change URL of existing post the first thing you need to do it to redirect URL to the new one otherwise URL will show 404 error as it might have already been indexed by Google.. The best part is that there are many free and easy to use WordPress plugins that help you to redirect any URL on your site easily.. When you change URL of any page then you can use 301 redirects to send the users to the new home. 302 Temporary Redirect. The plugin offers you advanced control panel to make it easier for you to manage all the plugin features and options easily... The plugin can help you by redirecting URLs to the nearest match URL on your site so that your users always get the kind of content they are looking for on your site.. It can handle HTTP to HTTPs changes, your content will be safe from any SEO related issues as it can manage all the redirections... You can redirect them to URL or you can redirect all the 404 pages to your homepage.. they will see the error page whenever anyone lands on those pages.. This is simple redirection plugin that will find ID in WordPress database and replace them with the correct new URL doing 301 redirect...
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