Peer review is a process in which students give each other feedback on their work. It's designed to be a positive experience for everyone: the student receiving feedback is able to incorporate suggestions into their work, while the student providing feedback can see examples of what others are doing and take some ideas for themselves.
Peer review is the giving of an opinion, it can't be done 'wrong'. That being said, it is important to give positive and constructive feedback - instead of simply saying what's wrong with the work, can you provide an idea on what could make it better? Make sure to praise the bits they did well too!
During Sokratis, you will be asked to review other students' work. You'll be given a rubric to use and the ability to write comments as feedback through the VC. You won't be asked to give 'points' for the assignment.