Here are some of my favorite functions.php snippets to include when starting a new website. If you want, you can use a plugin called Code Snippets and add / import / export functions that way.

If using GeneratePress theme, the functions.php might not be as popular because GP gives you customization options that you would otherwise need a functions.php snippet for… just sayin’.

Display Last Updated Date

I recommend using the WP Last Modified Info plugin.

// Add "[modified_date]" to the display

function post_modified_date() {
    return get_the_modified_date();
}
add_shortcode( 'modified_date', 'post_modified_date' );

Allows SVG in the Media Library

function meow_upload_mimes( $file_types ) {
  $new_filetypes = array();
  $new_filetypes['svg'] = 'image/svg';
  $file_types = array_merge( $file_types, $new_filetypes );
  return $file_types; 
} 
add_action( 'upload_mimes', 'meow_upload_mimes', 10, 1 );

Disable WordPress Administration email verification prompt

add_filter( 'admin_email_check_interval', '__return_false' );