Disable Comments in WordPress Dashboard
Go WordPress >>Settings>>Discussion
Uncheck The Box Allow users to Posts Comments
or Select Only Registered users can Comment on this blog. Also, make sure to disable registration in case of you installed BuddyPress plugin.
Active Installs 80,000+ Update 1 month ago
Allows administrators to globally disable comments on their site. Comments can be disabled according to post type. Multisite friendly.
How to Disable Self Pingbacks /trackbacks in WordPress
When you link to an internal page then you will get the pingback from the internal website.
manually disable pingbacks from WordPress dashboard
Untick Attempt to Notify any blogs Linked from Article. (But still I am getting this message)
Askimet; Free for personal up to 1-5 websites.
No self Pings; updated 6 years ago, Active installs 40000+
disabler: updated 2 years ago.1000+
delete All WordPress comments from PHPMyAdmin or database
DELETE FROM wp_comments WHERE comment_approved = 'spam';