You will need to determine a framework to base your lessons learnt on. In practice, lessons learnt discussions are usually framed in certain ways to illicit learnings from participants. Consider what is the most effective way to do this within the context of your group (Flex - if not in a group - for you as an individual), the course and the experience during the term.
You must develop, submit and present a 10 minute presentation (in Microsoft PowerPoint) discussing your reflection and lessons learnt, to your peers in week 12. If you are in a tutorial with more than 24 students, you may have to present in week 11 or within the lecture time in week 12. Make sure you discuss how your tutor is going to allocate presentation times. You must be prepared to answer questions from unit participants after your presentation.