The document discusses how completing a preliminary task a few months before their actual thriller project helped the author improve their camerawork and editing skills. They were able to avoid mistakes they made during the preliminary task when filming the thriller. Techniques like match on action, the 180 degree rule, and shot reverse shot were used effectively in both projects due to the knowledge and practice gained. The author provides examples to show how their skills with these techniques improved from the preliminary task to the thriller opening. Completing the preliminary task helped them learn editing software as well, making editing the thriller easier.