Peer editing can be a very useful tool for both parties. It is a great way to practice your writing and help your fellow students with his/her writing too. When editing a students paper you should always be careful on your approach and how you word your criticism. Peer editing is not always about the mistakes the person made, you should compliment on their work as well and express what you may or may not have liked about their paper.
There are many rules to follow when it comes to peer editing. The main rule that each of the sources touched on was to stay positive when correcting another student's paper. You must think of how you would like for someone to correct you, not offend them or make them feel bad about themselves. Another important detail in peer reviewing is being specific. Sometimes I find myself being like "Jean the Generalizer." When correcting another student's paper they need to know details, they don't need you to just point out an obvious mistake. You need to point out the problem and offer different ideas that could help make their writing more clear. Lastly no one needs to be a speedy sandy, because if you don't take your time you are more than likely going to miss several errors in their paper. If you're not doing your job then you're only hurting the other students.