Do you not want to allow anyone leave comments on your website? Well theres a simple plugin to control this throughout your WordPress website. Go to your WordPress Dashboard and select Plugins > Add New.
The type in Disable Comments.
Once you have installed it and activated it, go to Settings > Disable Comments.
Here you have the options to disable comments Everywhere or just on either posts, pages or media. Then you have the persistent mode which will forever disable comments by making changes to your database, we do not recommend this unless you know you will never want your comment system back.