Support for Drupal 7 is ending on 5 January 2025—it’s time to migrate to Drupal 10! Learn about the many benefits of Drupal 10 and find migration tools in our resource center.
There is excellent document at http://drupal.org/node/887560 that will be incorporated into the in-project documentation.
There are several excellent videos and tutorials available for Panels and Page manager (CTools) at https://www.drupal.org/node/561730