In this video Jerad Bitner walks you through the process of how to make a patch for a change to a contributed module on Drupal.org. We go through the steps for creating an issue, creating the patch and then submitting the patch. This video assumes that you have a git clone of a contributed module and are familiar with the basics of using git.

For instructions on getting a clone of a Drupal.org module and for applying a patch that you find on Drupal.org, watch the Applying a patch to a module video.