If you have a long form, it’s nice for the user to be able to see all their entries and verify what they mean to submit. Preview Submissions is a nice add on to Gravity Forms which will allow you to do just that. Click on Forms, Perks, Preview Submissions, Install and Activate:

Add an HTML block at the end of the form. Click on standard and drag out an HTML block:

Click on Advanced. Click on General, the small drop down to the right of content, choose All Submitted Fields. This will put {all_fields} in the content area and is telling the form to show all of the fields to the user prior to submission.