The first module explains the basics of what plagiarism is and the different types that exist, why people plagiarize and why it is damaging, and when it may be detected. It also discusses text recycling (sometimes called self-plagiarism). The second module covers the practicalities of using Crossref Similarity Check, including the different ways of uploading a manuscript, accessing a report and evaluating the Similarity Score. The third module shows how to refine and interpret the results obtained from a Crossref Similarity Check in order to determine if any overlap is present, and whether that overlap is problematic or not. The final module discusses how to assess any text overlap you detect and decide what action to take to take to correct it.