It's easy to write, that is, let your leaders know about you and reflect the value of your work. So write a few points:

1. What did you do? Concise and to the point.

2, which of these things need to be solved by your personal skills, or by your personal brain, so that leaders can see that you are working with your heart and brain. Even if there are no problems, you should write down the difficult problems and solve them through your own efforts, so as not to bring burdens or benefits to the company.

3, through the work, your understanding of the post and work. .

4. What abilities need to be improved or what knowledge needs to be supplemented in the future work, and you have already started to do and learn.

That's all you have to write.