Plagiarism, including self-plagiarism, is a serious offence in academics. UWindsor Leddy library has a list of tips on avoiding plagiarism.
SafeAssign is a plagiarism checking service available for UWindsor. However, it is slightly tricky to access the service. It is available in the Blackboard Learn system. Details can be found at the Wiki-page of UWindsor Blackboard Learn. "Direct submit" in the BB Sandbox course, is a quick way to check one's writing to avoid unintended plagiarism. It is not necessary to be a course assignment to use this service.