Work summary is to let superiors know what contribution you have made and reflect the value of your work.
So you should write several points:
1. Your understanding of the post and work.
2. What exactly did you do?
3. How do you work hard and what things you use your brain to solve? Even if it's nothing, write some difficult questions and how you solved them through hard work.
4. What abilities or knowledge do you need to improve in your future work?
5. The superior likes people who take the initiative to work.
Basic requirements for summary
1. Summary must have an overview and narrative of the situation, some simple and some detailed.
2. Achievements and shortcomings. This is the main content of the summary. The purpose of summing up is to affirm achievements and find out shortcomings. What are the achievements, how big they are, in what ways, and how they were achieved; How many shortcomings there are, what aspects they are manifested in and how they are produced should be clearly written.
3. Experience and lessons. In order to facilitate the future work, we must analyze, study and summarize the previous work experience and lessons, and form theoretical knowledge.