Help With Chapter Summaries?

In a couple of weeks, I will be starting high school. I’m taking Honors English, which mean I have summer reading. The teacher stated in a letter that we have to write a half-page summary on each chapter along with two quotes. I’ve easily done the quotes but I am struggling with the summaries. One book is 14 chapters while the other one is 25. Can anyone give me suggestions on writing summaries? The do’s and don’t’s?