Summaries can be hard because we're not sure what information to include. Here's a good formula:
Who is the main character, and where do they start the story?
Do they travel anywhere? Do they meet anyone important?
Are there any other big changes in their life?
What is the conflict?
How do they resolve the conflict?
Answer each of these questions with 1-3 sentences, and you'll have a good paragraph-long summary! If your summary needs to be longer, feel free to include more detail.