Self-plagiarism is reusing a piece of work you authored for a different class in a new class. Self-plagiarism is also submitting your same work from a class in your current course even if you are retaking the class. These instances are still considered plagiarism.
Below is a brief video from George Mason University Office of Academic Integrity explaining self-plagiarism.
If you are preparing your assignment in Google Docs (or you may upload your assignment in Google Docs to utilize this), Turnitin, the same software that your professors use in Canvas to check for Plagiarism has now developed a user friendly student Draft Coach.
Turnitin Draft Coach is a plagiarism tool that provides you with the ability to use Turnitin’s similarity tools in your Google Docs to help you work towards the final draft of your assignment before you submit to your teacher.
Note: This does not take the place of submitting an assignment in Canvas. It is a tool to be used to check work before it is submitted.
Understanding Turnitin Draft Coach
This student-focused guide explains features and important information included on the Turnitin Similarity Report, as well as guidance for using the information from that report to inform changes to student work and discussions with instructors.
From the TurnItIn Paraphrasing Lesson Presentation PowerPoint.