When you hand in work in Google Classroom, you have the option to add a private comment for your teacher.
This is a good place to let them know if you found anything tricky, if you did anything differently or if you have any other feedback on the task.
Your teacher can leave you an overall private comment on work you have turned in on Google Classroom when they mark it.
They can also leave a range of comments on different parts of your work to give specific feedback.
If there are changes needed, your teacher might return your work to you.
If this happens, it is SUPER IMPORTANT to read the feedback, make the changes or improvements suggested and then RESUBMIT it.