yehudah

Add a meta box to all posts, pages, custom post types to add the old url you want to redirect from (old url) to the new post. 
You can use redirection plugin here: <a href="https://wordpress.org/plugins/redirection/" rel="ugc">Redirection Plugin.</a> OR The other option is the website htaccess file.
This will help you create redirects while creating or updating your site posts or pages, so you don’t need to update the old and new links when you finish updating your website.
so you don’t need to remember:
<ul>
<li>The new posts or pages url</li>
<li>which post or page I all ready redirected ?</li>
<li>repeat 50% of the process again and so on ….</li>
</ul>

Redirect To WP

This will help you sync redirects while creating or updating your site posts or pages, This will sync to the redirection plugin or htaccess.

creativestudiollc

It is a plug-in that get out non-administrators from the dashboard. 
It works just by enabling the plug-in.
管理者以外をダッシュボードから追い出すプラグインです。 
プラグインを有効にするだけで機能します。

get_out_dashboard

Manage 301 redirections, keep track of 404 errors, and improve your site, with no knowledge of Apache or Nginx needed.

Redirect To WP vs get_out_dashboard