How to limit post revisions
Having unlimited saves of post changes can clutter your database and slow down the website performance
|Find the wp-config.php file in the root wordpress folder|
|Adding the line
define( 'WP_POST_REVISIONS', 3 );
will limit the post revisions to 3 (plus 1 autosave).
-1 is to keep all and 0 is for none
(except the autosave)