If your website is still running on Drupal 6, it's time to migrate.
When Drupal 8 is released, Drupal 6 support will stop soon afterwards. So, this is a great time to consider moving to Drupal 7.
In this class, Robert Ring shows you step-by-step how to perform the migration. Robert takes you through upgrading the Drupal core, contributed modules and themes. Along the way, he offers some great insights to some of the problems you might encounter and how to work around them.