Authorship is the most common and important way of crediting your research partners in publications. However, deciding who qualifies as an author and in what order can be challenging and contentious. There are no universal rules for authorship, but some general principles and guidelines can help you. First, you should follow the criteria and standards of your discipline, journal, and institution. Second, you should discuss and agree on authorship with your research partners before starting the project, and revise it as needed throughout the process. Third, you should base authorship on significant and substantial contributions to the conception, design, execution, analysis, or interpretation of the research, as well as the writing and revising of the manuscript. Fourth, you should avoid practices such as honorary, ghost, or guest authorship, which can undermine the integrity and accountability of your work.