Index: src/wp-admin/plugin-editor.php
===================================================================
--- src/wp-admin/plugin-editor.php	(revision 41973)
+++ src/wp-admin/plugin-editor.php	(working copy)
@@ -298,8 +298,8 @@
 		<div class="file-editor-warning-content">
 			<div class="file-editor-warning-message">
 				<h1><?php _e( 'Heads up!' ); ?></h1>
-				<p><?php _e( 'You appear to be making direct edits to your plugin in the WordPress dashboard. We recommend that you don&#8217;t! Editing plugins directly may introduce incompatibilities that break your theme or other plugins, and can leave you unable to log back in to WordPress and undo changes.' ); ?></p>
-				<p><?php _e( 'If you absolutely have to edit this plugin, create a copy with a new name and hang on to the original version, so you can re-enable a functional version if something goes wrong.' ); ?></p>
+				<p><?php _e( 'You appear to be making direct edits to your plugin in the WordPress dashboard. We recommend that you don&#8217;t! Editing plugins directly may introduce incompatibilities that break your site and your changes may be lost in future updates.' ); ?></p>
+				<p><?php _e( 'If you absolutely have to edit this plugin, use a file manager to create a copy with a new name and hang on to the original, so you can re-enable a functional version if something goes wrong.' ); ?></p>
 			</div>
 			<p>
 				<a class="button file-editor-warning-go-back" href="<?php echo esc_url( $return_url ); ?>"><?php _e( 'Go back' ); ?></a>
Index: src/wp-admin/theme-editor.php
===================================================================
--- src/wp-admin/theme-editor.php	(revision 41973)
+++ src/wp-admin/theme-editor.php	(working copy)
@@ -306,13 +306,14 @@
 				<p>
 					<?php
 					echo sprintf(
-						/* translators: %s is a link to Custom CSS section in the Customizer. */
-						__( 'You appear to be making direct edits to your theme in the WordPress dashboard. We recommend that you don&#8217;t! Editing this code directly is dangerous, and can leave you unable to log back in to WordPress and undo changes. There&#8217;s no need to change your CSS here &mdash; you can edit and live preview CSS changes in WordPress&#8217;s <a href="%s">built in CSS editor</a>.' ),
-						esc_url( add_query_arg( 'autofocus[section]', 'custom_css', admin_url( 'customize.php' ) ) )
+						/* translators: %s: Codex URL */
+						__( 'You appear to be making direct edits to your theme in the WordPress dashboard. We recommend that you don&#8217;t! Editing your theme directly could break your site and your changes may be lost in future updates. If you need to tweak more than your theme&#8217;s CSS, you might want to try your hand at <a href="%s">making a child theme</a>.' ),
+						esc_url( 'https://codex.wordpress.org/Child_Themes' )
 					);
 					?>
 				</p>
-				<p><?php _e( 'If you decide to go ahead with direct edits anyway, make sure to back up all your site&#8217;s files before making changes so you can restore a functional version if something goes wrong.' ); ?></p>
+				<p><?php _e( 'If you decide to go ahead with direct edits anyway, use a file manager to create a copy with a new name and hang on to the original, so you can re-enable a functional version if something goes wrong.' ); ?></p>
+				
 			</div>
 			<p>
 				<a class="button file-editor-warning-go-back" href="<?php echo esc_url( $return_url ); ?>"><?php _e( 'Go back' ); ?></a>