I've done "summary" type pages before using Calculations/Formulas and/or JavaScript, but it can get complicated depending on how many fields you have, what types of fields, and what rules you might have to show/hide different content.

The simplest method without using any JavaScript would be to just set up read-only fields that use calculations to display the values of the data entry fields.

For example, on one form I have a few multiline fields on the last page set as read-only. I use those as "summary" fields and they are populated via calculations/formulas.

You can add a line break through calculations using CHAR(10) and combine that with the JOIN function for multi-value fields from a table/collection, or a list of specific fields using brackets.

Using a Table column

JOIN(CHAR(10),Table.Column)

Using a list/array of fields

JOIN(CHAR(10),[Field1,Field2,Field3])

The formulas can get a bit complicated, but they do provide a lot of flexibility.