Peer review is a cornerstone of the scientific publication process. However, there is typically no formal training on reviewing papers as part of the regular undergraduate / master’s curriculum. It is a skill that you learn on-the-job as a PhD student when your advisor assigns you papers to review. You can a learn lot about writing papers by reading good publications. However, reviews are rarely published; you see a few examples as you submit papers to conferences and journals. (And that can be frustrating at times.) Here are some pointers to tutorials on reviewing.